Cons — Can’t find any.

Executive Summary

Introduction

Jason Wang has been an audiophile since middle school. In university, he invented current mode amplification (CMA). CMA devices are characterized by their crisp and transparent sound. It became his ambition to produce audio products with the best possible sound quality. But nothing can remain the best forever, so we should always keep questioning for better. He made this his lifestyle. Jason combined his two principles to form the company Questyle in 2012. Got it?

Questyle had a huge impact with their first digital analog player QP1R back in 2016. Three of us have purchased one – and it remains our reference to this day. Their flagship dap QPM made it onto our Wall of Excellence as true endgame. And the CMA Twelve DAC/amp also collected very good marks from our team.

The company recently also followed the trend of battery-less dongle DAC/amps. Such dongles are marketed to people who want to play music in high quality on their phones, and who don’t want to have a second device in their pocket.

The current market is flooded with dongles – we covered a few – and it appears to be increasingly difficult for a new release to stick out. The 2021 M12 was Questyle’s first effort in this field. Our two guys in Europe were not…too impressed. That’s probably because of their expectations of the crisp Questyle sound, which the M12 did not deliver. It was unusually warm and soft to their ears.

Spoiler alert, the M15 returns to the strictly neutral sound Questyle made its name with. There are a few more things to say, for example how they did it…let’s start with the physicals.

Specifications

Physicals

In the box are:

• 1 * M15
• 1 * USB-A to USB Type-C cable,
• 1 * Type-C to Type-C cable
• 1 * Instruction manual
• 1 * Warranty card

The body is made of metal with a glass cover on top so that one can see the internals at any time. Sturdy, robust…as good as it gets.

Technology

The Questyle M15 incorporates the ES9281Pro SoC (System on Chip) that comprises an all-in-one DAC and headphone amplifier, which delivers a prefabricated sound so that all such devices sound similar. STOP! This is not the case with the M15.

Questyle engineers have enhanced the output signal by adding two Current Mode Amplification (CMA) SiPs (“System in Package”: each with two independent amplification circuits) to achieve the Questyle sound, which is characterized by ultra low distortion, a very low noise floor and very low output impedance of around 1 ohm. This low-voltage configuration is further meant to minimize power consumption, beneficial for mobile use.

The reason why Questyle did not bypass the SoC’s amp altogether is because that’s virtually impossible. And the reason why they didn’t use a pure DAC chip such as the ES9038 is size – it is simply too big. The ES9281Pro chip also features a USB module. Therefore, size and performance dictated the choice of chip.

The M15 offers both balanced (4.4 mm) and single-ended (3.5 mm) circuits.

Functionality and Operation

What it does

• Works plug and play with Windows, Linux, and OSX computers and Android/iOS devices.
• Plays music though single- ended (3.5 mm) and a more powerful balanced (4.4 mm) circuits.
• Supports almost all music streaming platforms worldwide, including Apple Music, Tidal, QQ Music, among others.
• Fully supports and decodes ALAC, FLAC, MQA, and other lossless formats.
• Features two data status indicators that will illuminate one of the following colors: green (sample rate is 48kHz or less), red (hi-res lossless playback: PCM 88.2kHz~384 kHz, or DSD64~DSD256), magenta (final unfold of an MQA Core stream).

What it does not

• Has no on-board control.
• Needs a lightning adapter to be used with iPhone.

The Questyle M15 does not have an on/off switch. It draws current from the host device and switches itself on, when a headphone of earphone is plugged into one of its two sockets.

Amplification and Power Consumption

The manufacturer’s amplification data are rather cryptic so that I put the Questyle M15 to a practical test. The problem is that balanced cables for full-sized, power hungry cans are hard to come by – to take advantage of the M15’s 4.4 mm balanced circuit, which is much beefier than the single-ended circuit (a generally valid statement).

Running the 300 ohm Sennheiser HD 600 on the (weaker) single-ended output – to my surprise – did not only provide enough power, it also maintained the zing, bite, and clarity experienced with easier to drive earphones.

Then I ordered a balanced cable for the balanced circuit – which worked even better. The M15 has enough power to adequately drive a 300 ohm headphone.

Questyle claims that the M15 has an ultra-low power consumption (which, of course, is relative to performance). I did a quick test with the FNIRSI-FNB48 voltmeter. The M15’s single-ended circuit has about twice the power drain of the “frugal” AudioQuest DragonFly Red, and approximately one third more than the DragonFly Cobalt. Both are designed for low power drain, which comes with compromises in performance.

The Questyle M15 has, however, a much smaller current drain than the much less powerful Hidizs S9 Pro. And it works with iPhone that limited power draw to 100 mA, which shuts out similar dongles such as the Astell & Kern PEE51.

I’d say the M15 is very current efficient, but you’d still better have a decent phone battery.

Sound

The Questyle M15 has a sonic signature owners of Questyle equipment love: essentially neutral with great extension at both ends, unparalleled resolution, clarity, transparency, and crisp dynamics – and all that without ever being strident or aggressive, sterile or analytical (Topping comes to mind as the opposite). Almost like a little class-A amp in your pocket. If you have listened to the QP1R dap or the CMA 12 DAC/amp, you will know what I am talking about.

Spatial reconstruction is excellent in both single-ended and balanced circuits. No compromise has been made for the single-ended circuit, the only difference between the two is power. This is in contrast to some other models that sacrifice headroom in their single-ended circuit such as the EarMen Sparrow.

And that’s all you have to know.

Questyle M15 compared

Questyle had released the $150 M12 a year earlier. In contrast, it features only a 3.5 mm single-ended circuit, and, most importantly, it has a different sound: softer and warmer than the M15 or QP1R dap…which did not quite delight Alberto at the time. The M15 also has a gain switch for driving a larger variety of headphones.

Apogee Groove: is much more powerful, way higher current drain, a very high output impedance of 20 ohm, and it does not run with most phones, not at all with iPhones. Its use with hybrid iems is not recommended by the manufacturer. Sonically, the Groove is more coloured and it drives headphones without the need of balanced cables. The Groove offers the best spatial reconstruction of all dongles I have tested but is limited to single dynamic driver earphones and headphones.

With the Sennheiser HD 600, the Groove delivers more dynamics and a deeper stage than the M15. The differences are, however, not substantial. In summary, the Groove excels in it specialized applicability, but the M15 is more universally deployable.

AudioQuest DragonFly Cobalt is smaller and thus handier on the go, has USB filtering included and sounds a bit smoother and a tad warmer. It has similar imaging and spatial reconstruction qualities. It is less powerful – at a lower power consumption, and therefore more limited in its application. The evaluation of sonic differences relies on personal taste but are on par in terms of overall quality. Both offer stellar sound.

Practical Aspects

Questyle and similar dap manufacturers offer dongle DAC/amps to cover the phone/table/notebook market. A dap has principally a cleaner data and power source than a phone or a computer, as it is designed for playing music only. Computer and phone feature other clocked internals that introduce contaminations (“noise”) to the sound. So you are always better off with a dap, sonically – any USB DAC/amp (“dongle”) is a compromise.

When it comes to dongles, the user has to pick their poison: low current draw (= low power = battery preservation) vs. high power (= better sound quality = battery hog). Both are mutually exclusive.

You obviously need a powerful dongle to operate full-sized cans. Devices optimized for low current draw such as the AudioQuest DragonFlys will be easy on your phone’s battery however not do a satisfactory job on demanding headphones. Clipping will occur which will first be noticed when the bass is getting muddy.

Battery hogs such as Hidizs S9 Pro will do a better job on such headphones but empty your phone in no time. The Apogee Groove will not run with most phones at all. Powerful AND low battery drain does not exist!

There is a fundamental lack of technical understanding by some testers who run full-sized, insensitive cans on battery-preserving dongles, then rate them lowly. This misuse conveys the wrong information on the quality of such devices and distorts the playing field.

Therefore, if you have an old phone, a DragonFly type dongle may be right for you. If you want to run full-sized headphones from your computer, you may favour the Apogee Groove type. The Questyle M15 strikes a good balance between powerful output and current drain. However, despite its advanced power management, it is not a miracle power saver. In the end, you have to factor your intended usage into your buying decision.

Concluding Remarks

The very versatile Questyle M15 dongle is as good as it gets in its category. It is for listeners with very high standards. I will use this one for future iem testing…and submit it for approval to be attached to our Wall of Excellence.

Until next time…keep on listening!

Contact us!

Disclaimer

I received the unit from Questyle Engineering for my analysis. I thank them for that as well as for responsive in answering my questions. You can purchase the M15 at the Questyle Shop.

Our generic standard disclaimer.

The post Questyle M15 Review – Stellar By Starlight appeared first on Audio Reviews.

Cons — Relatively high impedance…benefits from amplification.

Executive Summary

Introduction

BQEYZ made themselves a name back in 2018 with one of the first neutrally tuned budget iems, the $30 2DD +2BA BQEYZ KC2, at a time when budget meant V-shaped. The KC2 is still available and has a dedicated following.

The company continued a class higher with the $139 1DD +1BA +1 EST BQEYZ Spring 1, which had wonderful vocals but a somewhat pillowy bass. The subsequent 1DD +1BA +1 EST $169 BQEYZ Spring 2 improved the bass somewhat. All of the above were metal built.

The subsequent $129 1DD +1BA +1EST BQEYZ Summer deviated with its translucent resin shells and finally featured the desired punchy bass.

We have collectively analyzed all of the above to the hilt, including Durwood’s study of the effect of nozzle mesh on the Spring 1’s frequency response.

The latest BQEYZ model is named “Autumn” after the third season of the year, hence “Tre Stagioni” (three seasons). With their BQEYZ Autumn, the company reverts to metal shells being essentially identical in shape to the Summer’s.

New is the driver configuration which is a single DD. BQEYZ also offer maximum sonic flexibility by including three sets of magnetic tuning vents at the font of the shells. Each of these pucks constitutes a different front vent with its very own bass response.

It is an interesting approach contrary to the JVC FDX1, the perceived bass response of which is dosed by screw-on nozzles containing different filters. Although these alter the JVC’s upper midrange response, the effect is only heard at the low end, as the human ear registers the whole frequency spectrum in context.

Specifications

Physical Things and Usability

In the box are the 2 earpieces, the cable, 3 pairs of tuning pucks in a holder, the magnetic tuner pole, 2 sets of eartips (S/M/L), a brush, and a carrying case. The three tuning pucks (“bass”, “normal”, “treble”) are actually the inner earphone vents (also called front vents). They come in different openings: the smaller the bassier. We describe the relevant physical principles in this article.

The metal pucks are inserted and removed with the included magnetic pole. This takes as long as a tire change during a Formula 1 race. The magnetic fit guarantees minimal wear and tear even when swapped frequently. Very handy.

The earpieces are made of CNC machined metal and are built very well. The overall haptic of shells and cable is great. BQEYZ have addressed the criticism of the BQEYZ Summer’s resin shells.

Fit and comfort are very good, isolation is rather poor for my ears. The cable has silver-coated copper and high-purity copper strands. It is loosely braided with minimal contact area between the strands for minimum interference. I find the cable rather pliable and light – it has no microphonics.

2 sets of eartips (S/M/L) are included, one wide bore and the other narrow bore. Note that the nozzle diameter exceeds the usual 4.5 mm so that many third-party eartips will not fit. You may try the SpinFit CP500 or any Azla SednaEarfit models if going for third-party tips.

Tonality and Technicalities

A universally valid assessment of the BQEYZ Autumn is difficult as tonality and technicalities depend on the interplay of several factors: magnetic tuning puck + eartips + source (in any combination). This versatility allows to you pretty much to create your own favourite sound.

Considering its 46 Ω impedance, the Autumn benefits from amplification, although it works surprisingly well with my iPhone SE (1st gen.). For example, the powerful Apogee Groove produces a much cleaner and better defined image than the weaker AudioQuest DragonFly Cobalt.

Using the JitterBug FMJ with the Apogee Groove makes quite a difference in that it ads definition to the image. The difference is actually considerable.

With the wide-bore stock tips, the “bass” vents generate more…yes…bass…which drowns the vocals out somewhat — and the “normal” vents bring voices more into the foreground without sacrificing bass impact. But this latter combination may be bassier than the combination of “bass” vents and JVC Spiral Dots.

I played with the stock eartips but got the best results with the JVC Spiral Dots that disperse some of the mid-bass and produce the tightest possible low end. Bass generally digs deep but the vocals move into the foreground with the JVCs. Signature becomes brighter but notes also cleaner and more articulate.

I also experimented with the vents, and the normal ones yielded the best result (in combination with the Spiral Dots). The bass vents “overthicken” the low end, move the vocals back and therefore remove intimacy and detail.

My favourite combination therefore is the normal vents with the JVC Spiral Dots.

So, how does the BQEYZ Autumn sound, actually (with “normal” puck and Spiral Dots)? It has the classic slightly warm single-dynamic driver sound with a rather crisp attack adding some edge.

The low end is on the tight side, it is well extended and remains focused to the lowest frequencies. There is no mid-bass hump as emphasis is on the lower frequencies, just above sub-bass. Drum kicks in the mid bass are not as pronounced as they could be but they are nevertheless hard as a rock – and dry.

Lower midrange is standalone without bass bleed. Male and female voices are somewhat recessed, of medium note weight, energetic, and natural. There is no shoutiness but we are getting there, although that 5 kHz peak is not irritating to my ears.

Midrange temperature is a bit cooler than in the bass region but still not quite neutral. Midrange resolution is very good, everything clean and clear there. Note definition is very good.

Lower treble rolls of substantially. Cymbals are a bit back and don’t have the best definition – but they are still ok. Resolution is better in the midrange than in the treble region.

Stage is average in width, height and depth. Spatial cues is very good. Attack is sharp and crisp without being aggressive. The dynamic driver is rather nimble. Stage positioning and separation are also good. Timbre is good.

I am a bit short in my sonic description as it mostly applies to this very particular setup.

BQEYZ Autumn compared

The dynamic-driver competition in the $200 region is tight. The Tanchjim Oxygen (which I don’t know) and the JVC HA-FDX1 are standard staples on our Wall of Excellence (also count the 1+1 IKKO OH10 in). The Moondrop KATO is arguably the company’s best dynamic-driver offer.

To disappoint you, it is impossible to tell which is the best of the lot as they are very close in terms of (sound) quality. But they differ quite a bit in ergonomics.

For example, the IKKO OH10 is very heavy in one’s ear, and so – but to a lesser extent – is the KATO. The Oxygen have short nozzles that may not fit everyone and the JVCs have a weird shape altogether that may not be the most comfortable for many either. In this respect, I prefer the Autumn’s compact shells.

But what I can say is that the Autumn sound more refined than the brighter $139 BQEYZ Summer, particularly in the midrange. The JVCs are not as crisp as the Autumn, they are smoother, dampened, with more rounded notes – but not as deep. The Autumn are rougher around the edges, more dynamic/energetic, and they have more midrange body and a much better sub-bass extension.

The Moondrop KATO are brighter than the Autumn (in my setup), with a wider but shallower stage. They have a smoother bass and vocals are not quite as intimate. They also have more sparkle with more air in the midrange. And they are more prone to shoutiness. How graphs can deceive us. Voices are a bit thicker and more rounded in the KATO. Treble resolution is similar between the two.

As I tend to say (well I stole it from Alberto): pick your poison!

Concluding Remarks

The BQEYZ Autumn are well built and good sounding single-dynamic driver earphones that fit their price category well – and that can prevail against their tough competition.

Whilst it is difficult to rank the large crowd of $200 single-dynamic drivers, the Autumn stick out in two aspects: comfort/fit and sonic versatility through the included tuning front vents. They are, in my opinion, the best offering in BQEYZ’s 3 season series.

Tre stagioni? Quattro stagioni! Now we are ready for “inverno”. No, that’s not what you think*…learn Italian…

Until next time…keep on listening!

*Italian: winter

The post BQEYZ Autumn Review (1) – Tre Stagioni appeared first on Audio Reviews.

Cons — Timbre not the most organic; large shells; rose gold not for everyone.

Executive Summary

The Hidizs MM2 is a well resolving iem that let’s you adjust the sonic signature with three screw-in outer vents. Another novelty is a magneto-static driver for the treble.

Introduction

Hidizs are a Chinese company that came on strong recently with their dongles and digital analog players. We analyzed their popular S3 Pro and S9 Pro DAC/Amps and their very good AP80 and AP80 Pro X players. As it looks, the company has a bit of catching up to do when it comes to earphones. Their MS1 Rainbow model received a mixed reception from Durwood and Loomis.

Hidizs’ latest MME iem implements a few semi-novel ideas, “self tuning” and a magneto-static driver for the uppermost frequencies.

Earphone tuning, the practice of generating a specific frequency response, has become an important marketing tool. YouTube/blog influencers lately picked up on it, projecting their personal preferences in the shape of “target graphs” onto the consumer – which provides a new revenue stream for them and the companies alike.

The consumer also benefits – from the lack of unpleasant surprises: no more “screamers” with icepick signatures in the mail anymore means much less risk of losing our money. On the downside, the consumer has to cope with silly avatars of the “celebrity tuners” on the shells – and an extra royalty to them.

So, why not do it yourself? There are several methods to tune your earphone according to your taste. First, the old “taping vents and nozzle methods”, as described in many of our reviews and also explicitly in our blog. This is referred to as “reversible modding“, which is based on simple physical principles. It is called “reversible”, as you can easily bring the iem back to its original state without any damage done to it.

But there are more convenient methods. For example, the Anew X-One comes with tuning modules that are being plugged into the faceplate. These look like little opamps and probably alter the earphone’s impedance. JVC’s HA-FDX1 deploy exchangeable nozzles containing different filters that change the midrange frequencies but keep the low end consistent. BQEYZ use a different method in their Autumn iem in that the user can change the width of the inner vent with magnetic pucks.

Hidizs have yet another approach to user tuning in their $79 MM2 by providing screw-in outer vents that change both lower and midrange frequencies. For the case you are confused now: the physics of “venting” is explained in our article. Let’s see how well it works for the MM2.

Specifications Hidiz MM2

Physical Things and Usability

In the box are the earpieces, cable, 2 sets of silicone earpieces (wide-bores and narrow-bores), 3 sets of tuning valves (bass, normal, treble), carrying case, and the paperwork.

Each screw-on tuning valve represents an outer vent. The included tuning vents therefore differ in opening diameter: the bigger the “hole” the more bass is produced.

The earpieces are very light and somewhat bulky…you see a lot of space inside them. But maybe these large “resonance chambers” are needed for the sound signature. They fit well, are comfortable, and don’t seal very well for my ears. Their lightweight comes in handy.

The cable is excellent: pliable, light, and it has no microphonics. Just the rose gold colour mix (and maybe the handbag-like carrying case) may not hit everybody’s taste. Both sets of eartips fit me well but I prefer the wide-bores.

Tonality and Technicalities

Equipment used: MacBook Air | Earstudio HUD 100 (low gain) with AudioQuest JitterBug FMJ | stock bass filters | stock wide-bores.

Since Hidizs give you the option to perform your own tuning with the included screw-in filters, I started tinkering with them…and finally decided on the bass vents as the created the “most substantial” sound experience for me with a great vocals reproduction.

In the big picture, the Hidizs MM2 is all in one: a neutral sounding iem (normal filters), a warm one (bass filters), and a screamer (treble filters ).

In my favourite “bass” configuration, the MM2 deliver a “fun” signature with some surprisingly good sonic characteristics.

Bassy filters means serious bass, without being too serious. Focus is on sub-bass. It digs deep, very deep – and with some energy. Mid bass slam has still good impact. This makes the low end a bit blunt and less tight than I want in some tracks. I don’t think the bass is overdone, though. All in good doses. It’s fun tuning after all.

The transition to the midrange works rather well. I would not call it bleed but the bass re-inforces the vocals in the lower midrange department quite efficiently. Although recessed, female and male voices are not lean or thin but have some nice richness and creaminess. They are not your stale black coffee but more a mocha latte with 2% milk. Notes are surprisingly well rounded. The MM2 beats a notorious weakness of budget iems in this department. And, although there is enough energy in the vocals, there is no shoutiness.

Treble is well resolving. Cymbals are very crisp, clear, and well carved out, but also a bit robotic, which is an artifact of this kind of driver. And since the treble sits a bit back, the cymbals are frequently covered up to some extent. I take it the magneto-static drivers are connected and working (as opposed to some of the competition’s).

Stage is no the widest but has good height and decent depth (with the bassy filters). Resolution, separation, and layering are astonishingly good. But…the timbre…is somewhat plasticky and could be more organic. Once I got used to it is as fine. That’s the biggest concern I have about this earphone – and I’d take $20 off for that.

And if you want to know how the MME compares to its peers, you find it in Kazi’s review.

Concluding Remarks

So why not tune yourself? By screwing in tuning filters you also screw the noisy YouTubers…that bad pun may be allowed. Hidizs have done a decent job with the MM2 and the tuning filters, which can be helpful particularly for newbies who want to learn different sonic signatures. Nevertheless, the MM2 could be $20 cheaper imo. But, maybe Hidizs let you tune your own price, too…see included coupons.

Until next time…keep on listening!

The post Hidizs MM2 Review (1) – Screw The Tuners appeared first on Audio Reviews.

Executive Summary

The Burson V6 Classic opamps are a valid alternative to the V6 Vivid opamps for those who prefer a leaner, wider, and better resolving sound. The V6 Classic work particularly well with acoustic pieces and jazz, but also with sources too warm for the V6 Vivid.

Introduction

Burson Audio is a >20-year old innovative company from Australia that produce high-quality DACs and amps. They started their business with opamps and other audio parts before dipping into complete devices.

I have exhaustively analyzed their lowest-priced amp, the Burson Funk, which, in its “Deluxe Package”, comes with a pair of Burson’s flagship V6 Vivid opamps that produce an energetic and dynamic sound. But the company offers another set of flagship opamps separately, the V6 Classic, which generate an alternative sound signature.

Both, V6 Classic and V6 Vivid retailed at $85 per piece/$145 per pair at the time of this review. You can order them from Burson. Both models are based on 12 years of research and carry a life-long warranty. V6 stands for Version 6 (or 6th generation). You can learn about their internals here.

What are Opamps?

Operational amps (“opamps”) are one of the building blocks of analog electronics circuits, used for sound optimization and customization. Opamps fine tune the’s sonic signature and help tailor the sound to the listener’s preference – similar to tubes in tube amps.

Opamps are universally deployable across different amps independent of brand. They are easily plugged into/pulled out of an amp’s logic board.

Caution, “opamp rolling” can be addictive!

Physicals and Installation

In the box are two opamps and two adapters. You don’t need the adapters when plugging the opamps into a Burson amp. If using them with amps of other brands, make sure there is enough space in the enclosure. Considering that most other opamps are these flat spider-like things, the Burson opamps are little skyscrapers.

You install the opamps by opening the enclosure (Allen keys included), align them according to manual, and stick them into the dedicated slots on the logic board. The Burson Funk, for example, has 2 such slots, one for speakers, and the other for headphones.

And if you align the opamps incorrectly, Burson’s unique “reverse voltage protection” prevents them from getting damaged.

The Burson Funk holds two opamps, one for the headphone circuit and the other for the speaker circuit. You can use a different opamp in each signal path. Many users prefer the V6 Classic for headphone use and the V6 Vivid for speakers.

Test Setup

I tested both opamp models, the V6 Classic and the V6 Vivid with the Burson Funk and different headphones/earphones. I used a neutral and a warm source to establish a possible source dependence for the performance of these opamps. After all, you’d expect the warm V6 Classic to pair better with a neutral source and the V6 Vivid to harmonize best with a warm source.

Neutral source setup: Questyle QP1R as DAC via AudioQuest Golden Gate RCA interconnects into Burson Funk amp. Warm source setup: Questyle QP1R as transport via Lifatec USA optical cable into EarMen Tradutto DAC and via AudioQuest Golden Gate RCA interconnects into Burson Funk amp; Sennheiser HD 600 headphones, JVC HA-FDX1 and Final E5000 iems.

Sound

Previously, I had tested the V6 Vivid opamps for my exhaustive Burson Funk review. What became evident to me was how the Burson Funk with the V6 Vivid opamps replaces the neutral signature of the Questyle’s own Class A amp with a slight warmth and an overall subtle tone colour. Sound is quite natural and definitely not digitally artificial.

Replacing the Vivid with the V6 Classic changes the Funk’s sound substantially — similar to exchanging the pickup of a record player or the earpieces on an iem.

To give you the helicopter view: the Classic make the Funk’s sound sound wider, more open, leaner, more neutral, and flatter, but also faster. In contrast, the V6 Vivid create a thicker, bassier/warmer, deeper, more dynamic but also narrower sound.

In detail, the V6 Classic deliver a tighter, faster, more composed bass compared to the V6 Vivid’s thicker, richer, and warmer low end with a better sub-bass extension, which contributes to the V6 Vivid’s deeper soundstage. On the other hand, the V6 Classic’s more forward treble makes for a wider, more open but also flatter stage. Due to the lesser warmth from the bass, the V6 Classic’s mids are leaner, cleaner, and clearer, as opposed to the Vivid’s richer, smoother, softer, and more rounded notes. This results in a better midrange resolution, transparency, and spatial cues in the V6 Classic.

Saxophones, cellos, and vocals sound leaner and “sharper” with the V6 Classic and smoother/richer/thicker with the Vivid. The advantage of the V6 Classic’s leaner presentation is “more space between notes and musicians on stage” and therefore better instrument separation and placement. A symphony orchestra on stage becomes easier congested with the V6 Vivid than with the V6 Classic.

On the other hand, the V6 Vivid have more dynamics and therefore a punchier sound.

V6 Classic: the right Choice for You?

The question is not which opamp is better, but which source and music fits better to which. I find the better resolving, “wider” V6 Classic better suited for acoustic pieces, classical music, and jazz. The more dynamic, punchier Vivid are better working for rock music and electronic…or anything noisy.

But that’s my observation for my combination of neutral source and neutral iems/headphones. If you have a warm source, you may overthicken your music with the Vivid, the same accounts for warm headphones and earphones. So you may have to balance the temperatures of source and headphones/earphones against the choice of opamps.

Concluding Remarks

My analysis shows that the performance of the V6 Classic (and V6 Vivid) opamps are to some extent source and output dependent. Whilst, admittedly, the V6 Vivid is more universally deployable, the V6 Classic caters to the listening to acoustic/classical/jazzy pieces and such who want to cool their coloured source.

In the end, the opamp choice relies on personal preference and savvy aficionados collect them all. Opamp rolling is not any different from tip rolling (and cable rolling) with earphones/headphones, it is just another enjoyable addiction for audio junkies.

Until next time…keep on listening!

Contact us!

Disclaimer

The V6 Classic opamps were provided by Burson – and I thank them for that.

Get the Burson opamps HERE.

Our generic standard disclaimer.

You find an INDEX of our most relevant technical articles HERE.

The post Burson V6 Classic Opamp Review – Carnegie Hall appeared first on Audio Reviews.

INTRO

Lately there seems to be an overwhelming desire for budget brands to break into the mid-tier market. There was not a lot of room to wow and differentiate in the budget class and now it seems we are seeing the same happen in what I consider the mid-tier $100-200.

While there is a whole wide range of offerings way upwards of that price range, they are more dangerous to your wallet as it starts reaching bragging rights and earning style points. Those I consider niche products.

The KBEAR Aurora was released an eternity ago in terms of fast fashion IEM’s and the only reason this comes to me now is a color refresh. One of our past reviewers Baskingshark had his go at them. We have some pretty strong $200ish contenders with recent hits such as the 7Hz Timeless now being challenged by the less expensive LETSHUOER S12, and the brilliant Moondrop Kato at $190.

Before that, people were singing the praises of the Drop JVC HA-FDX1 which runs between $200-250. The great thing is that all 3 of those have completely different strengths and tunings. So with value out the window, the KBear Aurora has to stand on it’s own and hope it doesn’t get lost in the sea of choices. I realize these have been out for 6 months and have already been forgotten. Just another NFAudio NM2+ perhaps, but in a better way.

Disclaimer: These were sent gratis via Keephifi and I hadn’t realized they were already released 5-6 months ago. Warm fuzzies were not exchanged until right now while I thank them for sending a pair to check out. I did not pimp my soul to promote these.

GOOD TRAITS

• Good universal fit and solid construction
• Good accessories
• Full sounding bass
• Perfectly sized carrying case
• No sibilance which should be standard for anything trying to sell for over $70. A low bar to clear in my opinion.

NEEDS IMPROVEMENT

• Low value
• Treble lacking in resolution and extension

PACKAGE CONTENTS

As with most Earphones over the $100 mark, the KBEAR Aurora comes packed into an easy open larger package that failed to keep the ears in place during shipment. I don’t typically care, but these are metal earphones so bouncing around in packaging is not a good thing given they can easily leave marks on the housings given the sharp edges on the faceplate.

The matte antique bronze color is definitely classier looking than the gaudy 1980’s neon chrome fingerprint magnet trend of the blue/chrome color. I think they should have released it solely in the matte brown first.

The braided gray snake skin looking cable is highly flexible and microphonic free. I notice the 2 pin connectors fit semi loose into the plugs however. The chrome/blue version sported a blue colored cable of the same style.

Two different sets of eartips, S/M/L of a standard widebore with a normal thickness stem, and 5 sizes of the main set that includes a widebore thick stem the same length of the outer tip.

SOUND

Right away it is easy to pick up the eastern style midrange boost that presents as a very in your face forward vocal. Snares are snappy as they should be. This hot upper midrange is preceded by the medium blend boosted bass that barely tickles the seismic region while going full bore into midbass territory with snappy and articulated fullness. Feels perfectly damped and well balanced with rest of the frequency range if you prefer stew over soup.

The treble on the KBEAR Aurora is the least noticeable asset. Inoffensive, bland and just one of those jobs you have to do but don’t put much effort to complete. The problem with this style of tuning is the upper midrange is so over-powering the treble doesn’t really get a chance to showcase what it can do.

For me the treble gives me the sensation of having stayed too long at the discotheque and consumed too many adult beverages. It is not particularly well defined. This was the same problem I had with the recently reviewed Whizzer Kylin HE03D. I have been ruined by the precision and air of the 7Hz Timeless and the control of the luscious Moondrop Kato.

TECHNICALITIES

The KBEAR Aurora sounds expansive, but lacks in depth. Clarity is only average with some cloudiness in the treble mucking things up. No real issues with the timbre until you get past the lower treble, it’s a single driver tuned in a typical +10db pinna gain in the upper midrange. It is driven easily by a smart phone, and has medium isolation.

COMPARISONS

Earlier there were hints at maybe a NFAudio NM2+ ($159) clone because to my poor memory I thought they were tuned similarly. Upon a review, the NFAudio NM2+ is a really hot intense listen, the Kbear gives my ears a break in comparison. Bass is very similar with the KBEAR Aurora recognizing lower extension is important.

The treble is still a bit chewed up sounding on the Aurora, but the NFAudio has so much upper treble my ears just give up looking for the upper end extension. Point goes to Kbear. Width and spacing sound more balanced on the Kbear Aurora. Fitment and isolation are similar.

The BQEYZ Spring 2 ($169) is another good comparison given the price bracket. The BQEYZ suffers from the droning bass tendencies again showing the KBEAR bass is tuned to be midbass centric as well with subbass only having a minor supporting role. Switching back and forth the BQEYZ Spring 2 can actually sound tiring due to this. Vocals sound smoother and treble is cleaner on the BQEYZ Spring 2, but the KBEAR Aurora seems to present more width in the staging aspect although lacking some treble resolution and extension.

When this was previously released the Moondrop Kato ($189) was just on the horizon, but now it’s available for only $20 more than the KBEAR Aurora. The Moondrop kato is more delicate sounding with a much lighter presentation than the Aurora.

The lower midrange/midbass boost give the KBEAR Aurora a more intimate smaller room presentation, but the treble lacks the resolution and clarity of the Kato. The Moondrop Kato has better resolution, more depth and a lighter airy feeling in comparison as if listening in a concert hall. Width feels comparable.

FINAL REMARKS

The color refresh of the KBEAR Aurora is much more elegant than the original shiny launch color scheme, however other brands have encroached on the pricing territory. It is a capable sounding IEM, I just have trouble recommending it based on value and a cloudy treble region. On the plus it is not a screamer or ear-piercer with most of the focus on the low to middle region, with good build and an above average accessory package.

GRAPHS

• Left vs Right
• KBEAR Aurora vs NFAudio NM2+ vs BQEYZ Spring2

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DISCLAIMER

Our generic standard disclaimer.

About my measurements.

You find an INDEX of our most relevant technical articles HERE.

The post KBEAR Aurora (Review 2) – Elegant Color Remix appeared first on Audio Reviews.

Instead of first impressions, we offer completely flavour-neutral optical treatments before following up with our exhaustive reviews of the products’ performances.

Current Photography

1. BQEYZ Autumn vs. BEQYZ Summer (Jürgen Kraus)
2. Hidizs MM2 (Jürgen Kraus)
3. IKKO OH2 vs. IKKO OH1S (Jürgen Kraus)

Vintage Photography (prior to March 2022)

1. AME Custom Argent Hybrid Electrostatic (Jürgen Kraus)
2. Anew X-One (Jürgen Kraus)
3. Blon BL-05 Beta (Jürgen Kraus)
4. Blon BL-05 Beta (Jürgen Kraus)
5. Blon BL-05 MKI & MKII (Jürgen Kraus)
6. BQEYZ Spring 1 (Jürgen Kraus)
7. BQEYZ Spring 2 (Durwood)
8. CCA CA16 (Durwood)
9. Drop + JVC HA-FXD1 (Jürgen Kraus)
10. Fidue A65/A66 (Jürgen Kraus)
11. FiiO FD1 (Jürgen Kraus)
12. FiiO FHs1 (Jürgen Kraus)
13. Hill Audio Altair • RA (Jürgen Kraus)
14. iBasso IT01 V2 (Jürgen Kraus)
15. Hilidac Atom Pro (Jürgen Kraus)
16. Ikko OH1 (Jürgen Kraus)
17. KBEAR Believe (Jürgen Kraus)
18. KBEAR Diamond (Jürgen Kraus)
19. KBEAR hi7 (Jürgen Kraus)
20. KBEAR KB04 (Jürgen Kraus)
21. KBEAR Lark (Jürgen Kraus)
22. Kinboofi MK4 (Jürgen Kraus)
23. KZ ASX (Jürgen Kraus)
24. KZ ZSN Pro (Slater)
25. Moondrop Crescent (Jürgen Kraus)
26. Moondrop Illumination (Jürgen Kraus)
27. Moondrop Kanas Pro Edition (Jürgen Kraus)
28. Moondrop SSP (Jürgen Kraus)
29. Moondrop SSR (Jürgen Kraus)
30. Moondrop Starfield (Jürgen Kraus)
31. NiceHCK Blocc 5N Litz UPOCC OCC Copper Earphone Cable
32. NiceHCK Litz 4N Pure Silver Earphone Cable (Jürgen Kraus)
33. NiceHCK NX7 (Jürgen Kraus)
34. NiceHCK NX7 Pro (Jürgen Kraus)
35. Queen of Audio Pink Lady (Jürgen Kraus)
36. Revonext QT5 (Slater)
37. SeeAudio Yume (Jürgen Kraus)
38. Senfer DT6 (Slater)
39. Sennheiser IE 300
40. Sennheiser IE 500 PRO
41. Shozy Form 1.1 and Shozy Form 1.4
42. Shozy Form 1.4 (Jürgen Kraus)
43. Shozy Rouge (Jürgen Kraus)
44. Simgot EM2 (Jürgen Kraus)
45. Simgot EN700 Pro (Slater)
46. Smabat ST-10 (Jürgen Kraus)
47. Tin Hifi T2 Plus (Jürgen Kraus)
48. Tin-Hifi T4 (Jürgen Kraus)
49. TRN-STM (Jürgen Kraus)
50. TRN V90 (Jürgen Kraus
51. TRN-VX (Jürgen Kraus)
52. Whizzer Kylin HE01 (Jürgen Kraus)

The post Photography appeared first on Audio Reviews.

INTRO

KZ Acoustics is one of the more well known budget kings where they take and constantly tweak models, the KZ X Crinacle CRN Zex Pro is no exception. I wouldn’t be surprised to see a third iteration. KZ has taken liberties with marketing slang to advertise it as an electrostatic but then clearly indicate later it uses an electret microphone. Not the same thing, but seems a little misleading.

So the the original KZ Zex was sort of interesting from a driver standpoint, but sported the usual KZ style of tuning. It received mixed reviews with the CCA NRA being a slightly better take on it from what I have seen but not experienced.

The Zex Pro attempts to rectify some of the short comings by adding a balanced armature to pick up the treble. The tuning appears to be a complete departure from the KZ ZEX based on reviews I have seen of the original ZEX. Instead I believe the KZ X Crinacle CRN Zex Pro is actually inspired by the popular JVC HA-FD01 or Drop JVC HA-FDX1. So if you were curious what a JVC HA-FDX1 sounds like with a sprinkle of bass lift and a resonant treble peak around 8khz, this gets interesting.

Disclaimer: No animals were harmed in the receipt of these free earphones from KZ. I would like to thank the post office for delivering them to my mailbox without incident.

Tested at $35 with the LG G8 and Sony NW-A55, Liquid Spark DAC + JDS Labs Atom

GOOD TRAITS

• Not another KZ tuning, something different and balanced
• Fitment fits snugly
• Isolation

NEEDS IMPROVEMENT

• Resonance around 8Khz, not just measured. Impacts Timbre.
• Higher volume improves staging, but at the expense of the resonance.
• Misleading “Electrostat” verbage if buying based on technology is how you make decisions.

PHYSICAL COMMENTARY

After removing them from the simple KZ white box, I surprised to find the KZ X Crinacle CRN ZEX Pro does not use the ZSN/ZS10 Pro/ZEX shell. Instead it appears to use what I think is the DQ6 shell that is more contoured and offers excellent isolation for a universal shell.

I received them shortly before my workplace decided to do some concrete ceiling work with a jackhammer. Perfect time to really put these to an isolation test. While I cannot say they are OSHA approved, I did find them to be excellent isolation when seated further away in a separate room, better than the more generic shells.

The KZ ZEX Pro 2 pin silver plated flat cable is a departure from the tangling prone twisted cable, and while it looks and feels meh, it does tangle less easily.

PACKAGE CONTENTS

• Detachable 0.75mm 2 pin 1.2m long cable with or without mic depending on order
• IEM pair
• 1 Pair each of S/M/L starline eartips

SOUND

So the KZ X Crinacle CRN ZEX Pro is not a minor incremental improvement of the original flavor Zex, but what is it? I had heard this signature before initially thinking maybe the ZSN series. After a quick measurement, I realized it looks eerily similar to the Drop JVC HA-FDX1 and well sounds a bit like it to.

The difference comes from a lower centered bass boost enough to add fullness to vocals and drums and upright bass that the JVC lacks. It departs from neutral but classifies as balanced for my definition. Vocals dance along the forward line, it’s a less vivid sounding than my preferred signature, but works great for jazz and classical.

For popular music the signature presents a studio effect. It doesn’t have the suckout though that more mellow KZ iterations such as the ZSN, or ES4 had with shoutier 2-4KHz treble plateau.

Listening to drums and cymbals I am picking up some extra twang from that resonance peak, this impacts the timbre as well. The KZ X Crinacle CRN Zex Pro treble experience is a nice departure despite that zest.

I feel like there is a hand off issue between the electret and the BA driver that reminds me of an audio tape slightly boogered up. I don’t always hear it, so it depends on if the music has information in that particular band.

TECHNICALLY SPEAKING

Excellent width combined with above average depth is a good fit for the KZ X Crinacle CRN Pro. While it seems unfair to keep comparing to the Drop JVC HA-FDX1, instrument spacing and overall blackness doesn’t reach top ratings for the Zex Pro, I would classify as above average.

There is not a 10x difference here though so ignorance can be bliss. As volume is increased it starts to sound a little crowded, so best to keep it mid level or a tick north of that for more liveliness.

COMPARISON

BLON BL-03 ($25) vs the KZ X Crinacle CRN Zex Pro ($35)

So I should probably compare the KZ X Crinacle CRN Zex Pro to something in the same price bracket right? The Blon BL-03 was widely dispersed so this should give an idea. Obviously fitment is better on the Zex Pro. Less punch on drums, more blended in the bass for the Zex Pro, the BLON has more natural timbre whereas the Zex Pro gives a more spacious feeling and ambient room portrayal.

There is a minuscule hint of forwardness in the BLON BL-03 only compared to the Zex Pro. Together these two characteristics make the BLON BL-03 feel closed in compared the Zex Pro. Since the treble rise occurs later and that pesky peak around 8khz, cymbals and flutes get more prominence in the the spotlight.

HAPPY ENDINGS

While the misleading use of electrostat leaves a bad taste in my mouth, the rather different tuning makes this KZ X Crinacle CRN Zex Pro a foray into experiencing what some people might view as a more natural tuning with extra low end and narrow treble boost that distinguishes it as a vivid budget HA-FDX1-esque.

Consider it a less technical version where your college roomate has turned the bass boost and treble knobs on that 1970’s vintage stereo system to make it exciting. It’s sculpted custom universal adds more secure fitment with good isolation, so if you played with their earlier KZ ZSR or DQ6 models, you will know what I mean.

I rank these as nice to have budgets way different from other KZ offerings and no issues recommending to friends, but not replacing my daily mid-tier favorites in the $150-$200 category.

I had no idea these were Crinacle branded until later when I was told by KZ to use the new ridiculously long name. I can understand that “X Crinacle” is the moniker used for models with his hand in the tuning.

I respect Crinacle’s work, it’s just too long of a name. I would have actually ditched the Zex Pro portion and give credit where credit is due, and if people didn’t like it so what. Chi-fi is a fast moving target where 6 months from now there will be other things in the market catching our attention.

SPECIFICATIONS

GRAPHS

• Left vs Right
• Zex Pro vs JVC HA-FDX1
• Zex Pro vs Blon BL-03
• Impedance

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DISCLAIMER

Get it from any available reseller.

Our generic standard disclaimer.

About my measurements.

You find an INDEX of our most relevant technical articles HERE.

The post KZ X Crinacle CRN Zex Pro Review (2) – Inspired By Drop JVC HA-FDX1? appeared first on Audio Reviews.

Summary

These two single-chip dongles (Bolt: ESS9281 Pro, UA1: ESS9218 Pro) are superficially similar but quite different sounding. The Bolt can be summarized as clean and midrange-focused, the UA1 as bass- and upper-mid-emphasized (more “Harman”). Which is preferred will depend on the transducers they’re paired with as well as the tastes (and budget) of the listener.

For this comparison I listened with JVC HA-FDX1 single DD & Ultimate Ears UE900S quad BA earphones to 16/44.1 FLAC files played via USB Audio Player Pro from a Nokia 4.2 Android phone. The Bolt is currently $110, the UA1 $45. For details on physical things, specs, etc., see Jürgen’s individual reviews here and here.

Helm Bolt

In summary, the Bolt’s tonal/timbral package is warm in the bass and more clean & precise in the upper mids & treble. With some material, these contrasting characters make it seem a bit disconnected top to bottom. While having good weight in the bass, bass & sub-bass can come across as a bit boomy, un-defined (one-note) & soft, particularly with the source-picky JVC HA-FDX1. 

With the UE900S, though, the tendency for softness in the bass goes away and the rounder character benefits the otherwise lean BA bass notes. Treble is extended but not overemphasized; ‘sweet’ would be the old-school audiophool term. The clean nature of the mids and highs gives a very good sense of instrument separation and imaging. 

Overall I found the Bolt to be very good with UE900S – they sound ‘cleaner’ than from other SE dongles I’ve tried them with and the tonal balance benefits their lean-in-the-bass, low-in-the-upper mids, tizzy-up-top character.

Shanling UA1

First impression of the UA1 is of good top-to-bottom integration and good resolution, with dynamics that are more consistent in character across the range. The top end is well defined but well controlled, not splashy. There’s good bass: with HA-FDX1, sub-bass definition & extension are certainly there, both better than with the Bolt.

However, the UA1’s upper mids are a bit nasal/honky/shouty, particularly with the FDX1s which are a bit elevated there. With those ‘phones the UA1 is more balanced at the extremes than the Helm, but a bit tonally and timbrally off in the mids.

With the UE900S, the bass remains good but the upper mids & treble come off as overexaggerated, sibilant and a bit hashy compared to the Bolt. Cable games might help this, but I’m not optimistic.

Matching

Comparing these two dongles with these two earphones shows the importance of synergy: the Helm is a much better driver for the UE900S than the UA1 is. The sweeter treble of the Helm helps balance the 900s’ overdone highs, and although the 900s’ dipped upper mids would ostensibly seem a better fit with the UA1’s tendency for shoutiness, they actually seem cleaner and better balanced there with the Bolt. The Bolt’s softer, rounder bass isn’t a problem, as it makes the 900s sound a bit more natural. With the FDX1s, however, the Bolt gives a very soft sub-bass compared to the UA1. Conversely, while the bass of the UA1 matches the FDX1s better, its Harmanish tonality does their upper mids no favours.

It’s tempting to attribute differences in the bass, in particular, to differences in output power.  According to Audio Science Review’s measurements, the Bolt clips at 60 mW into 32 Ohms and about 56 mW into 16 Ohms (HA-FDX1 impedance). Shanling specifies the UA1’s power output as 80 mW into 32 Ohms. The difference between the two dongles isn’t large and I doubt it tells the whole story, because the DragonFly Black is very anemic at 18 mW into 32 Ohms yet the HA-FDX1s don’t lose the definition in the sub-bass when fed from the Black to the extent that they do from the Bolt (warmth of the Black’s signature aside). I conclude that with these dongles, transducer synergy is ‘a thing’.

Other Quick Comparisons

Audioquest Dragonfly Black: pleasant warm emphasis (more than the Bolt), but everything softened and resolution lost (blurred, even a bit scratchy or fuzzy in the highs) compared to the Bolt and UA1. Would view as smooth if not by comparison. Smooth (but not soft) in the bass & lower mids; relaxing with the FDX1s.

Apple dongle: softer than DragonFly Black throughout, not as warm though.

EarMen Sparrow single-ended output: Bolt has better macrodynamics, more and cleaner treble, and is more resolving. UA1 has better note definition (resolution). Sparrow balanced output bests both in dynamics & resolution.

Ifi iDSD Nano BL SE (unfair comparison because: not a dongle, battery powered, 200 mW @ 16 Ohms, significantly more expensive; but included here for completeness because I compared it): darker tonal balance, timbre across the range more integrated, balance between dynamic swings & transient speed more even (maybe a little on the slow side compared to the ESS sound, but to me more natural because of that; organic). S-Balanced is a notable step up over SE in ‘cleanliness’.

Conclusion

It was interesting to hear such different sonic characters from these superficially similar dongles. I hesitate to recommend one over the other as transducer synergy, based on my admittedly limited trials, seems to be important. In general terms, I’d suggest that the Shanling UA1 might be the better match if you have ‘phones that are known to be demanding in the bass; and the Helm Bolt might be the better if you have ‘phones you find at the edge of your tolerance in the upper mids.

Disclaimer

These two dongles were sent to Jürgen for review by Helm Audio and Shanling, who we thank for the opportunity to hear them.

Our generic standard disclaimer.

Contact us!

You find an INDEX of our most relevant technical articles HERE.

The post Helm Bolt vs Shanling UA1 USB Dongle DAC/Amps Review – Freedom of Choice appeared first on Audio Reviews.

Gear of the Year: 2021 marks the blog’s third year and the second with 8 contributors. We collectively published almost 200 articles, mainly product reviews, but also technical information. Apart from receiving review units from manufacturers and sellers, we also purchased a lot…and we borrowed from audiophile friends and colleagues.

We are a heterogeneous bunch not pressed into templates by commercialism. Each of us enjoys maximum freedom. None of us gets paid. And it is this variety that makes this blog interesting. Two of us, Baskingshark and Kazi, have been drafted to also write for Headphonesty, which gives them more exposure and also access to very interesting gear.

We are currently experimenting with generic advertisements to recover our operating cost (Paypal does not work at all)…any money raised will go back into the blog. We remain non commercial.

Our main focus has traditionally been on earphones – we have reviewed almost 300 – but particularly DACs and amps also caught our attention this year.

As at the end of the previous years, we list our our personal favourites of 2021 – the portable audio we personally enjoyed most. There are no rules, we just tell you what we like. After all, the gear we use most is our best. And we attached some of this gear to our newly created Wall of Excellence, which averages all our opinions.

Enjoy this read and we wish you a happy and successful 2023!

We thank

Most of our reviews would have not been possible without our 2021 cooperating partners. We thank:

ADV, Allo, Apos Audio, Astell & Kern, AudioQuest, Azla, Blon, BQEYZ, Burson Audio, Campfire Audio, Cayin, CCA, Dekoni, Dunu, ddHiFi, EarMen, Easy Earphones, Fiil, Helm Audio, Hidizs, HifiGo, ifi Audio, IKKO Audio, KBEAR/TRI Audio, Keephifi, Khadas, Knowledge Zenith, Meze, Moondrop, Musicteck, NiceHCK, OneOdio, Penon Official Store, Pergear, Sennheiser, Shanling, Shenzhenaudio, Smabat, Snake Oil Sound, SpinFit, Tempotec, Tin Hifi, TRN Official Store, Unique Melody, Venture Electronics, Whizzer Official Store, Yaotiger Hifi Audio Store. Don’tkillusifweforgotyoujustsendusanotandwefixit. 

For the companies: you can check for your products/yourself in the search field on the right-hand side.

We also thank the private sources that supplied us with loaners.

And here we go…that’s what we enjoyed in 2021…

Alberto Pittaluga…Bologna, ITALY

I’ve come accross quite a few interesting pieces of gear in 2021, mixed / hidden amongst piles of shameful crap. Nothing new, is it ? I’ll try to make a succint list of the most significant stuff I auditioned here. Most of these devices are also now part of my operative audio gear.

IEMS

Dunu ZEN (discountinued, was $ 699,00) : beyond spectacular microdynamics, resolution, layering and technicalities in general. A masterpiece.

iBasso IT07 ($899) : the sole real “direct upgrade” to Ikko OH10 I encountered as of yet. Same presentation, twice the refinement, at more than four times the price.

Oriolus Isabellae ($ 599) : somewhat “more V-shaped” alternative to Zen, delivering very similar technical prowess.

Ikko OH1S ($143) : a potential new join into the our World of Excellence roster as a sub-200$ allrounder

Headphones

Final Sonorous-II  (€ 300) : arguably by far the best neutral-tuned closebacks in their price category, staging and imaging easily compete with many lower tier openback alternatives.

Sennheiser HD600 (€ 310) : not a novelty for anybody but me, I’m sure. Quite simply: I got my first HD600 pair in 2021 and that’s why I’m listing it here. I presume no one needs a description. Do you?

Earbuds

Rose Mojito ($259) : superbly neutral-tuned high end earbuds with strong bilateral extention, beyond spectacular mids and vivid, refined highs in a fully holographic stage, with plenty of resolution and dynamics.

K’s Earphone Bell-LBS (€ 59,25) : mid centric buds delivering superbly organic vocals – both male and female – and very good trebles

K’s Earphone K300 (€ 28,59) : unreal sub-bass extension for an earbud, they deliver a very nice V shaped presentation while drawing an incredibly sizeable 3D stage. Presentation remembers a bit Ikko OH10, but in earbud form.

DAC/AMPs

Ifi Micro iDSD Signature (€ 749) : top sub-$1K mobile dac-amp. Very high quality DAC reconstruction paired with superbly transparent amping stage with power to spare for the most demanding planars and power deflation options to optimise low impedance IEM biasing. Truly a full step ahead of the competitors’ pack.

DAPs

Cowon Plenue 2 MK-I (€ 835) : hopped on this recently when I found a impossible to turndown openbox deal. Starting from my direct experience proving that there’s pretty much no game between proprietary-OS DAPs vs commercial-OS (read Android) DAPs, the former being in by far better position to achieve superior output sound quality, Plenue 2 represents a great companion to my QP1R offering a different / alternative optimal pairing opportunity for a few of my preferred IEM drivers.

DAC/AMP Dongles

This year’s experience proved to me that exclusively higher-tier (and price) dongles are able to deliver sound qualities worth the comparison with battery-equipped alternatives. Simply put: pretty much nothing until an Apogee Groove ($200) is really worth the price difference compared to the super-cheap Apple Dongle ($9), and even on the Groove some caveats apply (power needs, amp stage competibility).  That said, I really had pick one device “in the midfield” I’d pick the :

Questyle M12 ($139,99): while still not worth an inclusion on our Wall of Excellence, yet M12 runs circles around pretty much all similar or lower priced competitors I assessed in terms of extension, note weight, clarity and technicalities.

Biodegraded…Vancouver, CANADA

Doesn’t have anything to report this year.

Durwood…Chicago, USA

Shozy Form 1.4 has still been my go to earphone due to it’s warm inviting nature, great technical abilities and it feels great in my ears.

7Hz Timeless is another good buy late in the year for me, it’s a little more sub-bass plus analytical counterpart to the Shozy that has nudged the BQEYZ Spring 2 out of the way. A more detailed review is coming.

I rediscovered the Senfer UES for a quick throw around set, was hoping the Senfer DT9 was a slight improvement, but alas the Senfer UES sticks around instead. Sony MH755 is also perfect for quick on the go usage where I don’t need the universal fit in-ears.

Tempotec impressed me enough to consider the Sonata E35 for when good phone DAP’s are finally dead. Other than that, dongles are not my thing, and I have issues with some of Sony’s GUI decisions on the NW-A55 mainly related to playlist creation and long text support.

Lastly, the Questyle CMA Twelve would be an awesome DAC/amp combo to have, but my needs are more mobile. Perhaps when life slows down, but there are other bucket list items such as the Burson Playmate 2, RebelAmp, the Ruebert Neve RNHP, or RME ADI-2 that look interesting as well. Maybe someone will loan me one in 2022?

Jürgen Kraus…Calgary, CANADA

Earphones have traditionally been our main trade and there’s not many that stuck with me this year. First and foremost, I was impressed by the immersive and engaging sound of the single DD Dunu Zen that further excel in microdynamics. They are still very popular within our team.

Moondrop finally got it right with their tuning in the smooth and very pleasant sounding Moondrop KATO single dynamic driver. This model is generally well received. The JVC HA-FDX1 are still my standard iems for equipment testing, and an honourable mention goes to the Unique Melody 3DT for the clean implementation of 3 (!) dynamic drivers.

Another iem that fascinated me is the Japanese Final E5000. On the market since 2018, and very source demanding, this iem can produce a bass texture beyond belief. I have become a bit of a Final fanboy, as their products are unpretentious and natural sounding…and they fit my ears very well. I also purchased the Final E1000, E3000, and A3000…which get a lot of usage. No surprise that our Wall of Excellence is decorated like a Christmas tree by quite a few of these Japanese earphones and headphones.

Expanding my horizon into other devices, the Sony NW-A55 is a user-friendly digital audio player with great sonic characteristics and signature-altering 3rd party firmware options. But, most of all, it updates its music library within a minute or two. For the ultimate portable enjoyment, I discovered the Questyle QP1R dap...sounds simply amazing with the Final E5000. Found the dap on Canuck Audio Mart.

Dongles, battery-less headphone DAC/amps that turn any cheap phone into a decent music player, were big in 2021. Around since 2016, the market caught on to these devices. But out of the mass of dongles tested, the 2019 AudioQuest DragonFly Cobalt was the most musical to my ears. I also like the AudioQuest DragonFly Red and the EarMen Eagle (replacing the EarMen Sparrow which I sent to Biodegraded). For earphone testing (and bigger cans), I still use the excellent Earstudio HUD100.

For my full-sized headphone needs with my notebook, I discovered the powerful Apogee Groove, a current-hungry dongle DAC/amp that has been around since 2015. I am even portable around the house. As to headphones themselves, I am still happy with the Sennheiser HD 600 and HD 25, but also with the Koss Porta Pro.

For my desktop setup, I identified the EarMen Tradutto as being a fantastic DAC in combination with the Burson Funk amp. Currently testing the Tradutto with my big stereo system.

In summary, I learnt a lot in 2021…

My Take Home this Year

• The latest is barely the greatest…many old brooms get better into the corners
• Influencers are not always right (…to say it nicely)
• Measurements are overrated
• Timbre (degree of naturalness of sound) is underrated
• Source is super important and also underrated
• Group pressure through hype may become a sobering experience
• That groomed YouTube stuff is boring

Kazi Mahbub Mutakabbir…Munich, GERMANY

This year was very educational for me when it came to audiophilia. I got the chance to try out truly summit-fi setups and realized how good a system can sound. This also resulted in a sense of yearning where you keep comparing the gears you own with the ones you cannot own, at least not yet. Nonetheless, without further ado.

Headphones: The one headphone that has stuck with me throughout the year is the Hifiman Susvara. They won’t flatter anyone with the build quality but when paired with the right amp they sound astonishing. One of the most natural sounding headphones out there with exceptional timbre. A must listen.

Honorable mention goes to the Final D8000. Supreme bass that’s pretty much unmatched. On the budget side, I really liked the Final Sonorous-III. They are underrated and under-appreciated.

IEMs: When it comes to in-ear monitors, I have a hard time picking any single one of them as all of them fall short in one area or another. Nonetheless, the one IEM I’ve used the most throughout the year is the Dunu Zen. There is something truly addicting about their sound that makes me come back to them time and again.

However, the Zen is not the best IEM that I have heard throughout the year. That would probably be the Sony IER-Z1R or the 64Audio U12t. In the relatively budget realm, the 7Hz Timeless took me by surprise with their planar speed and excellent bass slam.

Source: Instead of going with separate sections for amps, DACs and such, I will just consolidate them into one.

Best desktop amp I’ve tried: Accuphase E380. One of those rare speaker amps that sound great with headphones.

Best portable amp I’ve tried: Cayin C9. It is the only review loaner in the past year that I have wanted to buy with my own money. I probably will, soon, budget permitting.

Best DAP: Lotoo PAW 6000, even though it can’t power difficult loads.

Best dongle: L&P W2. The only dongle that I found to be good enough to replace some DAPs.

Best DAC: Holo May L2. The price is extremely high but so is the sound quality. Exceptionally natural and neutral tuning. Another must listen.

And that’s a wrap. Have a great Christmas, and see you on the other side!

KopiOkaya…SINGAPORE

Too many lists…I focus on eartips…

Best EARTIPS of 2021

Most versatile eartips: SpinFit CP-100+
Best budget eartips: Audiosense S400
Best eartips for bass: FAudio “Instrument” Premium Silicone Earphone Tips
Best eartips for vocal: Azla SednaEarFit Crystal (Standard)
Best eartips for treble: BGVP S01
Best eartips for soundstage: Whizzer Easytips SS20
Most comfortable eartips: EarrBond New Hybrid Design

Loomis Johnson…Chicago, USA

Gear of the Year (and other Favorite Things)

SMSL SU-9 DAC/Preamp—one of those pieces that makes you seriously question why anyone would spend more. A seriously good DAC which is even better as digital preamp.

Hidisz S3 Pro DAC/Dongle—lacks the juice to power challenging loads, but has an uncanny knack for enlivening and improving more efficient phones. Very refined, with impeccable bass control.

Cambridge Melomania TWS—ancient by TWS standards, and its rivals have more features and tech, but this may still be the best-sounding TWS you can buy.

Shozy Rouge IEM—like a really hot girl you get smitten by the beauty before you even delve into the substance. Properly driven, however, these sound just as good as they look, with estimable staging and clarity.

The Beatles, “Get Back” Documentary—as probably the only person on earth who hasn’t seen Lord of the Rings I was gobsmacked by how brilliant this film looked and sounded. The real surprise for me, however, was how natural  a musician John was—unburdened by technique, but soulful and  exploratory.  Poor George invokes your pity—a good writer forced to compete with two great ones– while Ringo wins the award for Best Attitude.

Bob Dylan, “Desolation Row”—I always found the lyrics impenetrable and a bit sophomoric, but the Spanish-influenced lead guitar part is incredible, with scarcely a phrase repeated throughout the full 11 minutes. I’d always assumed it was Mike Bloomfield, but it’s actually the harmonica virtuoso Charlie McCoy, who also plays the trumpet part of “Rainy Day Women”.

Reds, Pinks and Purples, “Uncommon Weather” In hope of finding something genuinely fresh I dutifully listened to the most-touted 2021 releases before fixating on this one, which (predictably) sounds exactly like 80s Flying Nun and Sarah bands.

And This Was The Previous Year:

The post Gear Of The Year 2021 – Our Personal Favourites appeared first on Audio Reviews.

Cons — Interference could be an issue with certain mobile phones or signals; SE output takes such a hit in dynamics and resolution vs balanced that it might be a waste for many users; power consumption via balanced is likely high.

Summary

The EarMen Sparrow is a flexible (balanced or single-ended), powerful USB DAC/amp dongle with great sound quality, being particularly dynamic from its balanced output. However, it can be susceptible to interference when run from a mobile phone.

Sonics and Comparisons

I listened to the EarMen as part of a comparison of a few USB DAC/amp dongles old and new. Listening to all was mainly done with the Drop+JVC HA-FDX1 single dynamic-driver IEMs using the Mee Audio MMCX balanced cable (SPC), with a 2.5 bal. to 3.5 SE adapter where necessary to minimize possible cable differences. Being an Android user, I sent audio (mostly 16/44.1 FLAC files) to the Sparrow with USB Audio Player Pro.

Balanced: From the balanced output, performance is impressive: macrodynamics, note definition & weight, instrument separation, and transient resolution are all excellent, making for a very ‘technical’ package. Tonal balance is good too, no particular part of the range seeming over- or under-emphasized.

While I liked it, the dynamic and fast presentation from the balanced output might become fatiguing after a while with revealing and dynamic transducers like the JVCs and especially with very ‘technical’ multi-balanced-armature IEMs. Matching with smoother ‘phones, or switching to the SE output, might be preferable for long listening sessions.

Single-ended: There’s a notable hit in macrodynamics and low-level resolution from the 3.5mm SE output vs balanced, and note definition, particularly in the bass, is weaker, leading to a much more relaxed presentation.

As mentioned above, depending on the transducers the EarMen Sparrow is paired with, this might not be a bad thing. The contrast however is very pronounced, especially when comparing with others: The Tempotec Sonata BHD, for example – a balanced-only unit – is itself pretty revealing but is notably less dynamic than the Sparrow’s balanced output and notably more dynamic than it’s SE output. And the latter is more relaxed than the single-ended Shanling UA1, and – except notably in the bass – than the single-ended Helm Bolt (which uses the same ES9281Pro SoC as the EarMen Sparrow).

Non-Sound Stuff

Here’s what might be a deal-breaker for some: when playing from the balanced output, the EarMen Sparrow can pick up interference when it’s close to a phone. This has been discussed on internet forums, and EarMen to their credit tried to address it by replacing the original cable with a longer, better shielded one.

I replaced the original with another that was reported to help, the OEAudio OEOTG, which improved the issue but didn’t completely solve it. If you can keep the dongle away from your phone, if you only use it in airplane mode, or if your phone/carrier/local signal doesn’t give you this problem (Jürgen tells me he didn’t experience it with his iPhone SE), great – but it might be a lottery.

For me (Nokia 4.2) it’s much reduced (or absent) from the SE output, but present enough to be annoying at listening levels from balanced when everything’s jumbled together in a pocket.

Minor considerations: unlike with other dongles, sometimes the EarMen Sparrow doesn’t play right away from UAPP when hot-swapped in after another dongle, requiring a re-boot of the player. This doesn’t happen every time, though, and I suspect a recent UAPP update might have cured the problem entirely; I haven’t seen it in the last couple of weeks.

Also, the EarMen Sparrow gets very warm in balanced mode – you can tell it’s putting out some power! This is good, but will come with a pretty high battery drain. Jürgen found the drain when using SE to be in the higher half of his tested units; be aware that balanced use will drain your battery faster still.

More Comparisons & Conclusion

The most obvious comparison among the units I have here – because it’s the only other one with a balanced output – is the dual-CS43131 Tempotec Sonata BHD. Compared to the EarMen Sparrow this has tonal emphasis in the upper mids, a splashier/hashier treble, a more rounded bass, and transients which apart from in the bass are similar in speed to the Sparrow but lesser in weight. However, the Sonata BHD is currently under 1/3 the price of the Sparrow.

The Earstudio HUD100 Mk2 (currently $120), a favorite of Jürgen’s which I haven’t heard, could make for an interesting comparison because although being single-ended, has two outputs, one with high power. Comparisons with other, non-balanced units should be seen in terms of price – and not having heard similarly priced SE units, I can’t usefully comment. 

Overall, I’m impressed with the EarMen Sparrow. The flexibility and differences in sound signature offered by the choice of outputs, and the absolute performance of the balanced output, make it a great contender in the dongle space. The interference issue however, is a serious one.

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Disclaimer

This is the same unit reviewed by Jürgen here, which was supplied to him by EarMen upon request.

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You find an INDEX of our most relevant technical articles HERE.

The post EarMen Sparrow Dongle DAC/Amp – Brief Second Opinion appeared first on Audio Reviews.

Cons — Sound could be more organic; relatively high output impedance; high battery drain, does not work with iOS devices; fixed cable; no basic accessories (e.g. USB-C to USB-A adapter).

Executive Summary

The Astell & Kern PEE51 is a dual-chip dongle dac that excels through its articulation, but its high current drain limits its portability.

Introduction

Ever since Gordon Rankin invented the phone-compatible dongle dac back in 2016 that turned even the cheapest phone into a decent digital audio player, many companies have jumped onto this bandwagon. Rankin’s original idea was a small device in the shape of a USB thumb drive without its own battery that was powered by its source, be it a phone or a computer.

The benefit was obviously both improved sound quality and increased output power. Downside of these early dongles was lack of compatibility with current-hungry, low-impedance headphones/earphones.

In recent years, phones as well as their batteries have grown in size and capacity so that most newer “dongles” draw more current, which works better with low-sensitivity iems and “bigger” headphones. This also benefits computer users, who are more concerned with amplification power than battery drain.

A big problem remains, however, in that Apple limits their devices’ current draw to 100 mA to protect battery life, which creates an incompatibility with many modern dongles.

Astell & Kern, a renowned Korean manufacturer of premium digital analog players, address music lovers with their PEE51 dongle that do not wish to carry a second device (a “dap”) in their pocket. And they decided on a technology that relies on high current draw, which does not work with Apple devices.

Specifications

Physical Things

In the box is just the dongle. Its housing and that of the the USB-C connector are made of solid metal. The braided, silver-plated, copper-shielded cable is fixed and can therefore not be exchanged/replaced. The overall haptic is very robust. The dac features a dual chipset for improved separation and crosstalk. What is not included is an adapter for connecting to a standard USB-A socket.

Functionality, Operation, Compatibility

The PEE51 does…

• work with Windows/Mac computers or Android sources with computer and Android phone
• consume a lot of battery

The PEE51 does not…

• contain a battery and draws its current from the source
• contain onboard controls…is operated from the source
• work with iOS devices
• connect to the standard USB USB-A socket (needs adapter)
• work well with 300 ohm headphones
• work well with sensitive earphones <16 ohm

The Astell & Kern PEE51 is operated from the source. A white LED on top of the case near the 3.5 mm headphone socket indicates its activity. The dongle is compatible with Windows and Mac computers, and most Android devices, but not with iOS devices. You find compatibility details on the product page.

Amplification and Power Consumption

As explained above, there are principally two end members of dongles. Such that draw little current and such that draw…erm…much. Both have their pros and cons. Little draw means limited power and sound quality but battery preservation. Good for the road. The AudioQuest DragonFlys are classic examples.

If output power has highest priority for you, go for the “battery hogs”. Better for home, ok with big Android-phone batteries. I had addressed the issue in this tech article. The Astell & Kern belongs principally to this group as it draws >100 mA. This explains the PEE51’s incompatiliby with iPhones and iPads.

But not all of the PEE551’s current goes into perceived amplification power. The 2 Vrms output power (without load) is rather average in this dongle class. Adding the relatively large output impedance of 2 ohm (the competition is <1 ohm) and the necessity to power a dual chipset make the PEE51 play quieter than other 2 Vrms dongles in my testing. It also experienced its limit when driving the 300 ohm Sennheiser headphones. It principally worked but lacked the “bite” of more powerful devices such as the Apogee Groove.

The 2 ohm output impedance may add hiss to iems with an impedance below 16 ohm (“1/8 rule”).

1/8 Rule: output impedance should not exceed 1/8th of the nominal impedance of the headphones.

Sound

Equipment used: Macbook Air + Sennheiser HD 600 | JVC HA-FDX1 | Final Audio E3000

The Astell & Kern PEE51 is a near-neutral, marginally warm dongle. It is fairly linear with a minimally boosted and rather dry and crisp bass. Midrange is clear and transparent. Vocals have a crisp attack without sharpness or grain, and they are a bit back. With the problematic HD 600, it lacks treble extension.

What makes the PEE51 stick out of the broad body of midprice dongles is its good articulation and note definition, which carries the handwriting of the dual chipset (that should improve separation and crosstalk).

The stage as a decent depth but only average width. I find the PEE51 deserves a bit more air and more ease, it always appears to work hard. Timbre is acceptable but not as organic as the DragonFly Cobalt’s (at twice the price). I also have to run the PEE51 at rather high volumes compared to the other dongles used.

Since any battery-less dongle is of limited sound quality, and considering the market being flooded with $100-200 devices, the PEE51 is sonically best characterized through comparisons with the competition.

Spoiler alert: these differences are only nuances. These dongles are rather close together.

The $129 EarMen Eagle sounds warmer through more bass, and more organic, and has a flatter and wider image. It has more air but lags in midrange articulation. Vocals are more intimate in the Eagle and it plays louder.

The $100 Earstudio HUD 100 MkII on high gain works much better with the Sennheiser HD 600. It has way more power and pizazz, and offers a bigger headroom. With iems on low gain, the HUD100 shows a different face as it does not have the PEE51’s crispness in the attack – and also not its depth. But it also plays louder.

The $104 Hidizs S9 Pro similar in neutrality to the PEE51, but is fuzzier in the bass and and not as resolving in the midrange. It offers a second, balanced, more powerful circuit (which I did not test in this comparison).

In terms of applicability, the HUD 100 is the most versatile as it works with all devices and even 300 ohm headphones well. The Eagle has the smallest power draw and therefore works best with iOS devices. The S9 Pro works will all, although it has a very high power draw – and is technically the worst imo. The Astell & Kern PEE51 is the technically best but has limited applications. Pick your poison.

Concluding Remarks

The Astell & Kern PEE51 is a quality dongle from a well respected manufacturer. It fits value wise and performance wise into the broad body of midprice dongles. Since none of these is perfect and suited for all applications, the listener has the torment of choice, which one to pick.

The PEE51 is optimized for hi res listening best with an android phone (with a huge battery) or a computer.

Until next time…keep on listening!

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Disclaimer

This loaner of the Astell & Kern PEE51 was provided by the company – and had been returned at the time of publication of this article.

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You find an INDEX of our most relevant technical articles HERE.

The post Astell & Kern PEE51 USB-C Dual DAC Cable Review – Articulation appeared first on Audio Reviews.

Cons — Elevated upper midrange may require micropore tape, not the greatest bass extension, a bit analytical; short nozzles/potential fit issue, mediocre cable.

Executive Summary

The Unique Melody 3DT is a gently U-shaped, marginally warm-bright sounding triple-DD earphone of excellent articulation that will appeal to most of us.

Introduction

Unique Melody from Guandong Province of China have been around since 2007. In these almost 15 years, they have built a reputation of designing audio products of the highest quality. This is my first encounter with the brand. And since I am a dynamic-driver aficionado, the 3DT with its three independent dynamic drivers is a most interesting model for me to analyze.

Yep, the Unique Melody 3DT is innovative in that its largest (!) 10 mm CNT (carbon nanotube) driver is responsible for the treble and mids, and their two smaller 7 mm compound drivers are covering the low end. The idea behind the tri-dynamic design is minimizing distortion. And it works as we will see.

Specifications

Physical Things and Usability

In the retail box are:

• Unique Melody x Dignis case x1
• Unique Melody 3DT x1
• 2-pin 0.78mm silver cable x1
• Warranty card x1
• Ear tips x8
• Unique Melody-branded cleaning cloth x1

The shells are 3D printed and their outer material is “stablized wood”, a mixture of soft, porous wood and resin, which results in a dense, impervious material. Each of the shells is unique in appearance and therefore has a custom look.

The shells are bulbous and somewhat big but also light, very similar to the Shozy 1.4’s. They are therefore rather comfortable – and insulation is excellent. I did not find them to be fingerprint magnets so that the included cleaning cloth is a bonus.

The nozzles are found being too short by some, which can provide fit problems. This is easily fixed by replacing the short-stemmed stock tips with long-stemmed ones (Azla SednaEarfit Light, long stemmed, worked well for me). Unique Melody could have included a long-stemmed set at this price.

The cable…well…it works well, has no microphonics and there is nothing really wrong with it…in fact, it is almost identical to the one that comes with the $600 Sennheiser IE 500 PRO. But it is tightly braided with a rather hard-shell material so that is appears somewhat brittle. It is certainly not the most pliable one. And it tangles easily.

The zippered storage case is pure luxury. Very nice.

Tonality and Technicalities

Equipment used: Questyle QP1R; Sony NW-A55; MacBook Air & AudioQuest DragonFly Cobalt/Astell & Kern PEE51; Azla SednaEarfit Light silicone eartips (long stemmed).

TL;DR: The 3DT’s overall signature is “well timbred”, marginally warm with a bright tilt, wrapped into a gentle U with slightly recessed vocals, and an overall excellent articulation and technical capabilities. All three drivers are rather nimble. Overall presentation is cohesive.

The low end is rather speedy for a dynamic-driver iem. The two 7 mm drivers create a controlled, well-textured bass that does not reach down as deep as some wished. This results in a subtle rumble at the bottom. A thumpy mid-bass hump is avoided – something my ears would not appreciated anyway. There is enough punch for me, decay is rather quick for a dynamic driver. I’d call the low end well dosed, articulate, and it does not smear upwards into the midrange.

This articulation continues into the midrange and treble. Vocals are a bit recessed and neither thick or thin but somewhere in between. They are well defined and sculptured and NOT aggressive, although they receive some energy from a boosted upper midrange. This elevation introduces some brightness to the overall warm signature. A mod is offered in the next chapter to mitigate this.

Treble extension and resolution are very good. There is great definition and body at the top end. The highest piano and violin notes are hit with accuracy, and cymbals sound rock solid. There is no sibilance.

Soundstage is rather wide and not so deep (but deep enough), and may not be the tallest. But it makes for good spatial cues. Note definition is great, note weight is intermediate. Timbre is excellent and layering and separation are good. The image could have some more air, however.

If I had a personal criticism it would be the driver speed pushing the signature towards analytical – it could be a tad more engaging. The three drivers interact flawlessly without an transition creating a coherent image.

Unique Melody 3DT modded

The 3DT’s 3-5 kHz area range may be a bit “spicy” for sensitive ears (but only a bit). Taping the nozzle screens off with surgical 3M micropore tape (don’t use Johnson & Johnson) removes some energy from this area without altering the bottom end. It also does not affect technicalities such as resolution and staging negatively.

The resulting frequency response is much more palatable to most ears and should have been implemented by the manufacturer. We have offered this technique for many earphone models and even dedicated an article to it. This mod is cheap, easy to do, and fully reversible.

Unique Melody 3DT Compared

I compare the Unique Melody 3DT to two single dynamic drivers, the $250 JVC HA-FDX1 and the $190 Moondrop KATO. The JVCs come sonically close to the 3DT but are a tad behind with a narrower stage, less clarity in the lower midrange, and not as tight a bass. The 3DT are slightly punchier with better spatial cues. These differences are, however, relatively small.

The Moondrop KATO are “fatter” and warmer sounding than the first two, which stems from their comparatively looser bass and a richer lower midrange. Vocals in the KATO sound fuller and more analog, but at the expense of note definition and midrange clarity. The 3DT sound more analytical and technical compared to the more relaxed and “casual” sounding KATO. An analogy would be a BMW M3 sportscar with a tight suspension vs. a Jeep Cherokee.

Concluding Remarks

The Unique Melody 3DT is a most interesting, innovate triple dynamic driver design packed in 3D-printed “stabilized wood” shells, with an articulate, organic sonic signature that will appeal to most listeners. It has no deal-breaking weaknesses and, unsurprisingly, comes with the recommendation of some audio forums.

As the company’s first offering to my ears, and considering their good reputation, my high expectations were met in full. The 3DT is one of these rare “Can’t-Go-Wrong” products. Very enjoyable.

Note: when I started this review, the Unique Melody 3DT was priced at $350, but the price had dropped to a rather competitive $259 at the time of publication.

Until next time…keep on listening!

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Disclaimer

The Unique Melody 3DT was kindly provided by the manufacturer through MusikTeck – and I thank them for that.

Get the Unique Melody 3DT from MusicTeck

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You find an INDEX of our most relevant technical articles HERE.

Gallery

The post Unique Melody 3DT Review – Très Bon appeared first on Audio Reviews.

Intro

The Questyle CMA Twelve (how dare anyone substitute a 12) DAC and Headphone amp combo is a solid hunk of amp with a very premium feel and a 2019 premium-ish price tag at $1499. All sorts of options up and down the scale. In my house the closest competitor is a whooping $200 stack of compact DAC and no frills headphone amp Liquid Spark + JDS Labs Atom.

Questyle has a wonderful track record for art and design however there is some not so happy thoughts on their customer service follow-through. The Questyle CMA Twelve DAC and Amp combo naming celebrates a whooping 12 year history in the headphone world. It’s a wonderful piece of machinery with a few minor near misses.

They claim a patented Current Mode Amplification technology sit inside cuddled up to Class A amplification. Sonically it does everything a premium product should do, powerful amplification, transparent noise-floor, butter smooth presentation with exceptional precision, I think I am in love.

Disclaimer

Let me first thank Audio46 for the opportunity to test this out in my home sanctuary. This is outside of the realm of equipment I usually consider so not a whole lot of equivalent equipment to compare it to. This audition audio tour sponsored on Head-fi set me back $20 in shipping, a small 1 week rental fee, how lovely.

Good Traits

• Solid Construction
• Excellent midnight black noise floor
• Resolution and clarity
• Input voltage for the masses, selectable 110/220V

Opinionated Commentary

There are only minor imperfections on the Questyle CMA Twelve

Low volume channel imbalance. It goes away after a few clicks up from 0 and is present on my normal setup as well. It should not a be a deal breaker, unless it exhibits this at listening level someone would actually use. There is also some electromagnetic feedback static induced into the circuit because it is motorized. Just more analog character charm.

The other strange thing I do not understand is if their claim to fame is the current mode amplifier running in their controlled/auto Class A bias mode, why is it not an option to toggle to headphone amp only mode with input from another DAC on the Questyle CMA Twelve?

A proprietary wireless receiver input that is not standard bluetooth. This is Apple thinking that the consumer will buy into a Questyle Ecosystem.

The last oddity is placement of the gain switches, there are 4 since they are independent for each channel (balanced). They are underneath. I understand from a circuit design perspective they wanted to keep it clean, but from a user experience it’s a tad annoying. If you never plan on using this with highly sensitive IEM’s no worries to be had.

Cosmetic Package

The design of the Questyle CMA Twelve has a geek side something that satisfies the more mature crowd without overly bright flashy displays, but instead goes for an engineer’s idea of a piece of lab testing equipment.

The indicator lights are not overbearing and very sharp looking. The toggle switches feel dainty, but my experience with these in my day job will no doubt prove to last a long time.

Power Consumption Tests

Seems silly to care but climate change anyone? No really my curiosity wanted to know how much extra power is used when switching into high bias setting on the Questyle CMA Twelve.

0.14/0.17A Standard vs High Bias
0.16/0.19A after warmed up
12W/15W Volume/load has no measurable bearing on this as expected for a Class A amp.
14W/16W after warm

Sound

The Bias switch does make a difference, I am glad they allow you to switch it on/off just to see the effect-show and tell. Bass has a little more haptic while the treble portrays everything more dimensionally.

Similar to going from a more dead room to a lively room, extremely subtle but still noticeable. The question is does this add coloring or remove coloring? I cannot answer but I would love to believe it makes it more expansive without coloring.

Testing the DAC output to my JDS Labs Atom, there was also a slight improvement in the separation of instruments, but as expected it is the total combination of the DAC and amplifier that are musical and organic.

The Questyle CMA Twelve treble comes off smoother and yet still more detailed. I found myself missing that extra little seismic information that it extracts when I went back to my Atom. Going from memory, I prefer the Questyle CMA also over the SMSL SH-9 due to the sterile cleanliness and the more analog volume control.

Power output should be plenty to drive almost anything, I don’t have anything besides the Sennheiser HD6XX that really needs the super power, but the Oppo PM-3 and JVC HA-FDX1 also benefited from the extra headroom. I pretty much used it in standard gain mode with everything since it was annoying to flip it over to make changes.

Other Fun Features

I am not really equipped to test these functions out but they are part of the Questyle CMA Twelve package for those interested.

• 4.4mm Pentacom or 4Pin XLR balanced output. I don’t have any cables to utilize.​
• Balanced output into an amplifier as a standalone DAC. I have no 2 channel system that would do it justice.​
• Proprietary 5Ghz wireless receiver input.​
• DSD playback, not my thing​
• Studio output, not a music producer/mastering engineer so no gear.​
• The Remote, probably more useful in DAC only mode. Buttons appear to be fuzz magnets.​
• Optical Digital Input
• SPDIF IN/OUT Composite
• AES/EBU input

Final Remarks

The Questyle CMA Twelve is a wonderfully sounding DAC amp combo that extracts the microdetails, plenty of connection options minus the ability to use it as a headphone amp only being the only drawback. If I had the desire to purchase gear over $300-400, this would be on my short list.

Since this product was released in ?2019 it doesn’t utilize the newest DAC chips or boast over the top SINAD numbers, yet it still sounds more musical and more transparent than my limited sampling. A caveat-I don’t want to pile on, but there have been some past complaints about support, and as you go up in price tiers the support is something you hope to never have to use.

Perhaps they will be more responsive if there is an issue, but this is something to consider with any brand in such a niche market. With that out of the way, overall excellent sounding DAC/Amp combo.

Specifications

DAC+Headphone Amplifier Section

Outputs:
4.4 mm balanced headphone jack
4PIN balanced headphone jack
6.35mm headphone jack

Max Output Power(Po):
247mW @ 300Ω; 900mW @ 32Ω(6.35mm headphone jack)
825mW @ 300Ω; 2W @ 32Ω (balanced headphone jack)

THD + N:
0.00070% @Po=100mW, 300Ω
0.00167% @ Po=50mW, 32Ω

Frequency Response:
DC-20kHz(+0, -0.4dB)@0dBFS, 24Bit, 192kHz
DC-80kHz(+0, -3dB)@0dBFS, 24Bit, 192kHz

SNR: 112dB, non-weighting

DAC+Pre-Amp Output Section

USB Type B Input:
Support 44.1kHz-384kHz/16Bit-32Bit PCM and DSD Native DSD64, DSD128, DSD256, as well as DSD64, DSD128, DSD256 of DoP format
(Note: support Win XP, Vista, Win7, Win8, Win10 and Mac OS)

Digital Input & Output:
SPDIF input and output, Optical input, AES/EBU input
Support 44.1kHz-192kHz/16Bit-24Bit PCM

Pre-Amp & DAC Section:
Balanced XLR x1 pair, unbalanced RCA x1 pair
STANDARD 14dBu: XLR: 5.084V RCA: 2.549V
STUDIO 20dBu: XLR: 8.887V RCA: 4.475V
THD+N@STUDIO 20dBu: XLR: minimum at 0.00085% RCA: minimum at 0.00115%
SNR: XLR:>112dB RCA:> 109dB (non-weighting)
(Note: FIX/ADJ: Fixed Output Mode or Adjustable Output Mode of the pre-amp.)

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Disclaimer

Since Audio46 loaned this out, you can check out the QUESTYLE CMA TWELVE at their storefront. No affiliate links, no kickbacks.

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About my measurements.

You find an INDEX of our most relevant technical articles HERE.

The post Questyle CMA Twelve – Blissfully Biased appeared first on Audio Reviews.

Cons — Upper-midrange glare.

Executive Summary

The Shanling UA1 is a well-built and organic sounding budget dongle that could be a bit tamer at the top end.

Introduction

I recently analyzed the Shanling UA2, a rich and warm sounding dongle-shaped DAC/amp that features single-ended and balanced outputs – possibly the best of its kind below $100.

The company had slit the the $45 UA1 as an encore in that package, which was Shanling’s first foray into the world of small DAC/amps. It joins an army of sub-$50 dongles that presently crowd the market – but with a distinct difference: Shanling is a brand name that is also established in the premium segment.

Let’s find out whether “noblesse obliges” also works for the budget domain.

Specifications

Physical Things and Usability

The box’s content is spartan: device, USB-C to USB-A adapter, and a manual. The enclosure is made of anodized aluminum, and the 3.5 mm headphone socket is reinforced with a gold-plated metal rim. There is a tiny LED status light by the socket. The haptic of the enclosure is top notch.

The fixed cable is made of high purity copper with cotton shielding against outside interference. The strain reliefs appear to be sturdy but a detachable cable would have been favourable.

Functionality and Operation

The Shanling UA1 is another entirely source operated/powered DAC/amp. It works plug’n’play with mobile devices and Mac OS, but requires a driver for Windows.

It is powered and operated from the source device and decodes Hi Res up to 32 bit/384 kHz and DSD 256. I have not found MQA decoding capability in the documentation.

Amplification and Power Consumption

I my 3h battery drain test of several dongles, the Dragonfly Black and Red had the lowest consumption on my iPhone 5S, the Shanling UA1 consumed about a third more, which placed it in the midfield. But it could have done far worse than that….see the detailed results. I would call the UA1’s battery consumption ok but not outstanding.

Power Consumption Test: Parameters and Raw Results

I tested the power consumption of several portable headphone amps connected to my iPhone 5S. The conditions were as identical as possible: 3 h test, volume calibrated to 85 dB  ± 0.5 dB white noise with Dayton microphone, no sim card, BT off, no other apps open; network on, 32 ohm Blon BL-03 iem, Genesis’s Supper’s Ready (from the Seconds Out album) played in an endless loop.

The iPhone’s battery was fully charged at the start of the test and the remaining charge was measured thereafter. The result is shown in the table below. Since the tests were performed at different times and considering the ongoing battery deterioration, the results have to be seen with a grain of salt.

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Sound

Equipment used: Macbook Air/iPhone SE first generation; Sennheiser HD 600 & HD 25; Sennheiser IE 400 PRO, JVC HA-FDX1, TRI I3 Pro.

The Shanling UA1 features the ESS ES9218P (dac + amp), a “System-on-Chip” (SoC) that leaves the audio engineer little room for tweaking, it comes down to mainly filtering. This means devices with this SoC will actually sound alike or very close.

The UA1 is close to neutral, but has a faint tone colour with a slightly boosted bass, but also with an elevated upper midrange/lower treble, which adds some grain to the top end top-end that can be fatiguing to some in the long run – and that’s the UA1’s only downside. There is a companion app for Android phones that allows filtering which may mitigate the issue, but it does not work with a computer or iPhone.

Presentation is leaner compared to a $100+ dongle, but not in a bad way. Staging is fine. Midrange is clear and clean, and resolution is pretty good. Nothing sterile or analytical. I also did not record any hiss.

It drives my 300 ohm Sennheiser HD 600 with some pain but any iems, including the power-hungry planar-magnetic TRI I3 Pro earphones with ease.

The $99 Helm Bolt and Shanling UA1have a very similar general sound signature (and even a very similar build; the Bolt decodes MQA, the Shanling does not). The Bolt has less bass, which is a tad tighter and cleaner, it sounds more open and the vocals are more up front because of it, and it is a bit more dynamic. The UA1 has more low-end rumble whereas the Bolt is more composed and “sweeter” at the top end. These differences are not earth shattering but the Bolt appears o be better balanced by more sophisticated filtering.

When going up the ladder, the $85 Shanling UA2 has a richer, bassier sound, better staging, better 3D rendering, more punch, and the corners are smoother.

Concluding Remarks

At $45, the Shanling UA1 is an impressive performer with a warm-bright, organic signature, good staging, dynamics, and resolution that does justice even to $200-300 iems (I have not tested any higher-priced ones as I don’t have any). The only polarizing feature may be its hot upper midrange/lower treble glare, other than that it plays one league higher than its price and comes close to the $99 Helm Bolt that shows a few better rounded corners. However, the Shanling’s lively top end will bring some life to iems with an early treble rolloff.

I am a particular fan of the great haptic and build of Shanling’s UA1 (and also the UA2) that compare even to the most expensive models.

Until next time…keep on listening!

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Disclaimer

The Shanling UA1 was included with the UA2 and ME80 in a review package from the manufacturer. I thank them for that. I sent the UA1 to Biodegraded for a second opinion.

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You find an INDEX of our most relevant technical articles HERE.

The post Shanling UA1 Review – Prefab Sprout appeared first on Audio Reviews.

Cons — Included “Spring Tips” too small for big ear canals.

Executive Summary

The Moondrop KATO か と is a well-balanced, smooth sounding single DD earphone that sets a new standard in the $200 region.

Introduction

In the Japanese syllabary of Hiragana, か と stands for “ka to” or Kato, which is the 10th most Japanese surname. I struggled with these characters in my Japanese class at university during the mid 1990s…in order to end up in China later – many times. And yes, it was Chengdu, Sichuan, the home of Moondrop. C’est la vie. But we digress.

The 10 also stands for the number of Moondrop iems I have reviewed, following the company’s odyssey of tunings, always with micropore tape on standby to tame the iems’ upper midrange.

But, to my absolute delight, there is no more tape needed for the か と, pardon “KATO”. It is as smooth as silk. I said it weeks earlier in the SBAF forum, Moondrop are raising the <$200 bar with this model.

Now, before you pull the trigger on your order, please read on. The fact that this iem is astounding still does not mean everybody will love it. There are some strange listeners out there, after all.

The か と, erm…well…you know…is a further development of the $190 KXXS, which was a modification of the $190 KPE (Kanas Pro Edition). I don’t know the KXXS but found the KPE incoherent in that it was warm and thick at the low end and overly lean and neutral in the midrange. I did not like it.

The $110 Moondrop Starfield was said to be very similar sounding as the KXXS (although some disagree), but they are somewhat “loose” at the low end compared to the Kato.

The $90 Aria has recently rolled up the Moondrop field from underneath for being coherent, articulate, but it is also a bit peaky, which nevertheless made it my favourite Moondrop model so far…until now. Spoiler alert: the KATO is even better in that it is smoother and richer. Everything in the KATO is bigger compared to the leaner Aria. It is like a cappuccino with generous whipped cream vs. a strong cup of black tea.

Specifications

Physical Things and Usability

In the (rather big) box are the two earpieces, 2 sets of screw-on tuning nozzles (steel and brass), a carrying bag and a carrying case, a set of foams and a set of Moondrop’s own “Spring Tips”, the earphone cable, and the unavoidable paperwork. Generous!

The steel earpieces are virtually identical with the KPE’s and KXXS’ from the outside, but inside they host a new Ultra-Linear Technology driver for improved dynamics and resolution (info on product page). All these earpieces have the same comfortable fit.

The cable is bordering on spectacular – and you know I usually don’t care much about those. It is of medium weight and intermediate stiffness with fantastic haptic and no microphonics.

The in-house developed “Spring Eartips” also feel superb: they have a rather thin membrane and feel extremely grippy. Unfortunately, they are rather small so that even the largest pair does not fit my ear canals. In contrast, the foams are of generous sizes. And since foams generally do not do it for me, I have good results with the Final E tips (clear version). With those, isolation is ok.

The Moondrop KATO can be driven with a phone, but they get more life when amplified.

Tonality and Technicalities

Equipment used: Sony NW-A55, MacBook Air + Audioquest DragonFly Red/Earstudio HUD100/EarMen Eagle + AudioQuest JitterBug FMJ; steel and brass stock nozzles; Final E tips (clear version).

Sonically, the Moondrop KATO has no sharp corners or other sonic vulgarities, everything is well measured and well composed. To achieve this, low end and midrange have been dialled back compared to previous models.

Despite lesser quantity, the low end is digging deep down into the lowest frequencies with the bass climaxing at the transition to the sub-bass. This avoids a thumpy midbass. The low end is weighty with enough rumble, and the mid bass has a good punch, but both are well dosed and not overwhelming – and rather smooth and subtle. Decay is realistic and there is no bleed into the lower midrange. The bass adds some colour to the mix.

In contrast to its predecessors such as the KPE, the KATOs’s midrange also has some colour which harmonizes much better with the low end. The KATO’s midrange is fuller bodied with well rounded notes and a good weight but also offers great clarity, transparency, and spatial cues.

New is the lack of an upper midrange (and treble) peak which attenuated and sharpened vocals in the Starfield or, to a lesser extent, in the Aria. Nothing aggressive in the KATO. Hurrah, Moondrop finally did it and I can retire my micropore tape I used to stick onto so many Moondrop nozzles to tame the upper midrange.

Treble has better extension than (many) previous Moondrop single DD models but always remains sweet, composed, and well resolving, contibuting to KATO’s overall cohesion.

Staging and imaging are outstanding. Soundstage has good depth and height at average width. There is no congestion, great three-dimensionality, very good separation and layering. Transients are realistic, which adds to the smoothness.

I summary, the Moondrop KATO is one of (if not) the smoothest and most homogenous iems I have tested.

All of the above was determined with the steel nozzle. The brass nozzle adds body to the sound but also removes clarity. I therefore prefer the steel nozzle, which was also used for the comparisons below.

Moondrop KATO compared

Since Moondrop have pursued their VDSF target in their recent single DD models, their frequency responses are all rather similar – but not their sound. The biggest difference is probably between the KATO and the $800 Moondrop Illumination in that the latter has a much more boosted upper midrange, which made it somewhat shouty to my ears. I much prefer the much cheaper KATO.

In comparison, the Moondrop Aria has more bass and a prominent treble peak, which makes it overall more aggressive sounding. The Aria is also leaner, cooler, and edgier sounding with inferior imaging. So yes, the KATO is a worthy upgrade.

The Moondrop Starfield is looser and less measured across the frequency spectrum with earlier treble rolloff and a narrow stage. It is also behind the KATO in terms of technicalities and I even prefer the Aria over the Starfield.

The $250 single DD JVC HA-FDX1 (on our Wall of Exellence “WoE”) have been a very highly regarded standard staple for the last 2 years, mainly because of their rather accurate tonality at a very reasonable price. The JVCs are more neutral and crisper in their attack compared to the warmer, smoother and more immersive KATO, which lack the JVC’s upper midrange glare.

The JVCs have a flatter stage, the perfect bass, they are harder to drive, but they are tonally very accurate and are even cleaner sounding than the KATO. It is a bit silly to compare these as both are superb in their own way.

The IKKO OH10, also on our WoE, has a more pronounced V-shape than the KATO with a thicker, boomier, more impactful/more satisfying bass and more recessed leaner and sharper, that is more energetic midrange. This results in a huge soundstage. Again, the IKKO OH10 are a different beast and not exchangeable for the Kato.

Finally ddHiFi Janus2 (taped) is shouty and thinner (in the midrange) sounding than the KATO. It also has less bass. The Janus2 is not remotely as smooth and cohesive as the KATO.

Concluding Remarks

Moondrop finally got it 100% right. Their KATO is a super smooth performer with a superb overall presentation. It is technically and tonally good enough to please both analytical and recreational listeners. You cannot do better at this price, as simple as that. Just bo and guy it. What…?

Until next time…keep on listening!

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Disclaimer

The KATO was kindly provided from Moondrop via their distributor Shenzhenaudio – and I thank them for that.

Get the KATO from SHENZHENAUDIO.

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The included fabric-covered cable, however, is very microphonic and lacks any memory function, which makes fit awkward. I do note that HifiGo also sent me a lavishly-packaged Kinera Leyding cable (review to follow), which was much more-user-friendly.

Quasi-custom shaped shells are large and fairly heavy but comfortable for extended use and, especially with the grippy Azla tips, seal and isolation are excellent. Aesthetics are okay for the price point (I personally think the translucent acrylic undersides look a bit downmarket), but build is solid.

Pairing with source is hyper-critical for the SeeAudio Bravery—through much trial and error I ascertained that sources with higher output impedance (such as my Aune T1 Mk2 tube amp) made the bass sound bloated and tubby, while sources with lower output impedance, such as my Hidisz S3 dongle, considerably tightened the low end and sped up transients, albeit at the expense of some warmth and note weight. (I do believe that the Bravery is particularly susceptible to damping factors, whereby low damping makes causes slow, indistinct bass and high damping  makes it leaner but cleaner).

All that said, the SeeAudio Bravery is easy to drive at 18Ohm/110dB and, surprisingly, I found my unamped, Quad-DAC equipped LG mobile to be as good a match as any. Likewise, I found the included foams to provide the best combination of low end boom and zoom.

As thus driven and tipped, the SeeAudio Bravery presents a mildly U-shaped signature with a bright tonality and a lush note texture. This is a forward-sounding IEM, with a narrowish but deep and well-rounded soundstage which places the performance towards the middle but avoids congestion on complex arrangements. Instrument separation and layering are good but there’s not a ton of air between the performers. 

NOTE: The upgraded Kinera Leyding cable audibly widens the stage and increases the sense of space between musicians.  Low end is impactful for an all-BA–subbass isn’t deep as good DD sets and, at least with the stock cable pitch resolution isn’t optimal  and the lowest notes can sound slightly monotonic on some material (although, again, the upgraded cable improves low-end resolution, especially on electric bass).  

The SeeAudio Bravery does avoid excessive bloom and has plenty of midbass presence and volume. Mids are slightly behind but very clear; male voices have a lot of body. There’s a considerable rise and added energy in the upper mids and lower highs, which can make female voices and synths sound a bit sharp or shouty at times.  

Treble is well extended and very full-sounding, without the metallic edge that sometimes affects the mids. They are not as hyper-revealing or analytic as something like the NF NM2+, but retain nice sparkle despite their weighty highend presentation.  Percussion is particularly vivid and crisp and low-level details like handclaps and cymbal reverberations are captured well.  Integration between frequencies is good but not perfect—again the mids stand out just a little.

Tonally, the SeeAudio Bravery by no means aspire to transparency or audiophile accuracy—there’s a definite coloration to their sound which injects a lot of sheen and aliveness to the proceedings; uptempo genres have a real toe-tapping quality even if, as noted, these can sound a bit metallic at times.  

Well regarded, comparably-priced players like the Logitech UE900S or the JVC FXD1 are better at the technicalities, with more accurate, less colored timbre, better coherence and a smoother, less spiky midrange, while the Aune Jasper is likewise more refined and coherent, with better-tuned bass. However, the SeeAudio Bravery trumps all the aforesaid in that hard-to-define quality of listener engagement—it simply sounds bigger, bawdier and more exciting.

I remain undecided if  the SeeAudio Bravery is a good value at $279—it probably comes down to whether you favor its more dynamic, spicier quality over the more tonally accurate quality of a Moondrop, Shozy, etc.

Consider, however, that unlike most of its peers, which require a DAP or amp to sound good, the SeeAudio Bravery works well with a humble phone (although you’d also be well-advised to upgrade the cable, so perhaps it’s a wash). Undoubtedly, the bold tuning, with its aggressive upper  mids, will prove polarizing and/or exhausting to some. BUT they  dorock hard. Which, at the end of the day, is tough to put a price on.

Disclaimer: Sent to me gratis by HifiGo for review purposes. From our experience, HifiGo is certainly aggressive about pushing out samples, but have  never solicited (tacitly or otherwise) favorable reviews nor (unlike most of their competitors) gotten pissy when we’ve panned one of their products. So kudos to them.

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Cons — Fixed cable.

Executive Summary

The Helm Bolt is a very small and light MQA certified portable DAC/amp that excels in terms of its organic/natural reproduction.

Introduction

The source-operated dongle dac-amp has experienced a huge upsurge recently. Originally designed in 2012 to convert your phone into a high-quality digital analog player (dap) and first able to do so in 2016, the market is currently flooded with tens to hundreds of such devices – which makes it is essentially impossible for a single person to keep the overview.

Prices range from a handful of dollars to $400 with a crowding in the $80 to $150 range. The Helm Bolt fits into this sweet spot.

Helm is a young British-American company that specializes in portable devices from headphones/earphones to amplification.

The Bolt is the company’s sole portable DAC/amp that works with a phone, either alone or in combination with the Helm DB12 AAAMP amp. It appears to be a popular item as it is always sold out. Many favourable reviews of the unit exist already, so I would like to put it to my ultimate test.

Specifications

Visit mqa.co.uk for more information.

Physical Things and Usability

The box/s content is rather spartan: Helm Bold, USB-A adapter, and pleather storage case.

The dongle comes with a fixed USB-C cable, which is great for connecting to an Android device or a newer Mac, and, with the USB-A adapter, to a Windows computer. But using the Bolt with an iPhone requires the Apple camera adapter, which doubles the “snake” in length. Since the enclosure of this 8 g dongle is very small, the whole construct is effectively just an extension of the earphone/headphone cable.

The housing is made of metal and feels premium. The cable is cotton-shielded against outside interference and the strain reliefs on both ends could be a bit longer and sturdier.

The Bolt has no physical controls and is operated through its host device. It is completely plug-n-play, and does not even need a Windows driver.

The enclosure features a small LED that changes colour with playback rate/type: Blue SD Audio <= 48kHz – Red HD Audio > 48kHz – Magenta For MQA.

Headphone output level automatically detects headphone impedance and sets level accordingly: 1V for < 150 ohms, 2V for >= 150 ohms, which corresponds to low gain and high gain. The device is plug and play, there are no Windows 10 drivers needed. 

Amplification and Power Consumption

The Helm Bolt drives all iems I have thrown at it, but it reached its limits with the 300 Ω  Sennheiser HD 600. For large cans, Helm offers the Helm DB12 amp [product page],which can be used in series with the Bolt. The DB12 adds a constant 12 dB gain, and a 6 dB bass boost (if selected).

I my 3h battery drain test of several dongles, the Dragonfly Black and Red had the lowest consumption on my iPhone 5S, the Helmo Bolt consumed about a third more, which placed it in the midfield. But it could have done far worse than that….see the detailed results. I would call the Bolt’s battery consumption ok but not outstanding.

Power Consumption Test: Parameters and Raw Results

I tested the power consumption of several portable headphone amps connected to my iPhone 5S. The conditions were as identical as possible: 3 h test, volume calibrated to 85 dB  ± 0.5 dB white noise with Dayton microphone, no sim card, BT off, no other apps open; network on, 32 ohm Blon BL-03 iem, Genesis’s Supper’s Ready (from the Seconds Out album) played in an endless loop.

The iPhone’s battery was fully charged at the start of the test and the remaining charge was measured thereafter. The result is shown in the table below. Since the tests were performed at different times and considering the ongoing battery deterioration, the results have to be seen with a grain of salt.

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Sound

Equipment used: Macbook Air/iPhone SE first generation; Sennheiser IE 400 PRO, Meze Rai Solo, JVC HA-FDX1; Sennheiser HD 600.

The Helm Bolt has an organic sound with a good tonal colour. It is not warm and not neutral, that is not dark and not analytical, but it strikes a balance between the them. The presentation is clean and lean (in a positive way), think of slimline – as opposed to fat and congested.

The Bolt is not the bassiest dongle, which keeps the vocals up front. Midrange is clean and clear with a tinge of warmth. One of its biggest qualities is the very pleasant, well-rounded, smooth, appealing top end. It works well with most earphone/headphone signatures and, in particular, helps taming shouty ones.

Compared to the $10 Apple audio adapter or the $10 VE Odyssey HD, the Bolt sounds much more refined and it is more powerful. The $50 Shanling UA1 features the same SoC and almost identical specs. Both therefore feature principally the same sound signature with one big difference at the top end: the Shanling is much scratchier/grainier in the upper midrange and lower treble. Helm must have applied effective filtering.

The Shanling UA1 is also a tad bassier which pushes the vocals back. The Bolt’s bass is tighter and cleaner, it has a more open sound with a wider stage, and it is a tad more dynamic.

Scaling up to the $200 AudioQuest DragonFly Red. The Red is punchier, bassier, fuller bodied with bigger staging and more midrange clarity and depth. Bolt is more relaxed, softer on the attack and has the lesser separation, but is sweeter in the treble.

Using the Bolt as a preamp and adding the Helm DB12 as an amp opens up the stage substantially, however takes away from the note weight. The sound is fluffier, bigger, “inflated” like a balloon. But since both devices have fixed cables, this combination can create some cable chaos in your pocket.

Concluding Remarks

The Helm Bolt is a fine sounding dongle which I like a lot. It may not have the strongest amplification but it has a very refined sound. It sticks out of the crowd by its small size and weight and convinces by its natural sonic reproduction. The Bolt has played any iem well for me I had thrown at it. It is a quality product and I am not surprised it is always sold out. It is a serious contender in the $100 segment.

Until next time…keep on listening!

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Disclaimer

The Helm Bolt was supplied by Helm Audio for my review – and I thank them for that.

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You find an INDEX of our most relevant technical articles HERE.

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A device gets attached to this Wall of Excellence when based on our private and of course subjective experience it performs so well within its technical and price category as to even discourage considering homologous alternatives.

If it ain’t here, WE don’t want it!

Please note that our WoE will not be limited to devices we actually published a review of. Nonetheless, all WoE devices have for long time been or still are part of our operative gear.

We start small and plan to expand our wall according to merit.

This Site is being consistently updated…please bookmark it and keep checking back!

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