Not only in absolute terms – it is nothing short of an absolutely out-dash-standing device – but in relative ones too: it taught me personally so much for such a low price and effort that even when I outgrow it I will forever stay in debt of a smile and a hug.

And times for back-condescending reminiscence are not even on the horizon at the moment. For the simple reason that I reckon it will take quite some more time for me to have the budget – which I would assess in approximately 1K€ – to invest in a real stack upgrade, vs yet another step in the sidegrade carousel which is what Groove teleported me out of really.

A quick TOC before we start, for those who wouldn’t bother reading “all” my bla-bla (yeah, you’re forgiven):

What’s that?

Apogee Groove is a USB DAC-AMP device.

I’m pretty sure a wide portion of the budget audiophile community have never heard about this, in spite of it being on the market since 2015. Chances are many have never heard of Apogee Electronics Corp. in the first place, indeed.

Apogee is a US-based professional audio equipment designer and manufacturer in business since 1985. They earned their glory (and money) from audio professionals thanks to their patents and products: initially analog filters which would retrofit Sony and other high-end analog devices significantly upgrading their quality, later followed by breakthrough-innovative Digital Audio interfaces. Their target market is musicians, producers, and sound engineers – it’s therefore quite normal their brand is totally off the usual chifi marketing hype circus.

Groove is Apogee’s “entry level” portable DAC-AMP aimed at providing audio pros with an easy-going tool they can carry with them and plug onto their laptops while on the go, delivering a quality which needs to be in-line with Apogee’s higher-end equiment the same customer is supposed to regularly use in their studio. E.g. Apogee Symphony, to name something.

I’m not here for marketing but I find this storytelling video from Apogee’s web site explains superclearly what their intendend positioning is about Groove. (TL;DW: “[Dad, an affirmed musician,] is listening to super-high quality stuff all day every day […] so I bring the Groove, plug it into the laptop, and it feels and sounds as if it was in the studio”)

Getting closer to the actual device: no internal battery, Apogee Groove needs to be connected to a USB host (a PC for example) to even turn on. The USB channel is its only input – both for power and digital data.

“Cmon, cut it. It’s just a dongle!”

Yes and no. Structurally it’s a dongle yes. But it’s bigger, heavier and most of all it absorbs 340mA from the host, which is a lot. It’s therefore technically possible but practically unviable to use a phone, or a tablet, or even a lower end DAP as an easy host / transport. For on-the-go usage a Laptop is reasonably required, or some DIY creativity with a nice battery bank and a tool like iFi iDefender+. But let’s not deviate – for the sake of this article let’s say this is a “hi-power demanding dongle”.

It’s got a single output: 3.5mm single ended phone out. It supports PCM up to 24 bit / 192 KHz, and does not support DSD, nor MQA. Specifications are available here. Some numbers might seem odd at first glance.

“LOL! No MQA, no balanced output. My dongle’s specs are 3 times better, and I can use it for hours on my phone !…”

… Keep reading

As a DAC: just phenomenal

Die-hard measurement freaks may want to take a look here. No, it’s no ASR.

The reconstruction filter is very good, but by far the most important of all those graphs is the frequency response one, which is wonderfuly linear well into the 60KHz range, and that’s why when playing FLACs sampled at 96KHz Apogee Groove delivers clarity and space reconstruction audibly even superior to what it delivers from 44.1KHz data – where performance is nonetheless already a full pair of steps above the usual budget suspects.

Compared to Groove, some other systems (often coming with the not too secondary “feature” of a 10X price tag…) may arguably be even more precisely optimised for 44.1KHz data, but their response drops dramatically rapidly immediately after 20KHz (e.g., Hugo).

Enough graphs. Let’s audition.

Starting from the most evident part: Apogee Groove draws on space in a totally stunning way. Yes, already at 44.1KHz – and even more mesmerisingly at higher sampling rates.

Never heard something like that before, and I yet have to hear anything really similar let alone better. Spatial reconstruction is nothing less than phenomenal out of the box, and that, and imaging, are easily better than what I can hear from Chord Mojo, iFi nano iDSD BL, iFi Micro iDSD Signature, as well as Questyle QP1R, Lotoo Paw 6000 and Gold Touch – when considering their DAC performances. Groove is really one class above. At least one.

Apogee Groove’s DAC also delivers high end detail, texture, openness and intonation. All other DACs I heard as of yet barred none offer a paler representation of instrument textures. Some may have a blacker background (e.g. Micro iDSD Sig), or can offer higher sharpness on high end details (e.g. Mojo), but most if not all the alternatives I heard are fundamentally duller (in comparison) and/or smear on detail and/or miss out on that unique, incredibly well calibrated “suspense factor” Groove puts in transients.

Summarising: Apogee Groove delivers a totally unique dimensional feel to the sonic images. It’s technical, but musical. Controlled, but emotional.

Compared to mid-tier competition Apogee Groove’s DAC wins easy, and big. By just casually plugging it in and listening the difference it totally obvious.

Its DAC tuning quality taken per se is actually at an even higher level than its price would suggest when compared to professional tier alternatives, but in that case Apogee Groove’s small physical size starts to represent an issue as it makes it technically impossible to pack high level of power filtering inside, or a separate, cleaner powering line, like it can be found on superior systems (Holo May, Schiit Yggdrasil…).

The little kid can be belped a bit though, and per my experience it’s big time worth doing it, as its performances furtherly improve and significantly so:

• privilege a Linux distro + a technical, lightweight music player, or an Android box + UAPP, over a generic Windows or Mac system;
• filter out and/or divert the VBUS power line into a cleaner source;
• manage grounding issues and rebalance DC;
• reclock / regen the USB signal;
• etc

On my #1 desktop stack Apogee Groove is USB-connected to the laptop host and powered via an iFi Nano iUSB3.0 (my take on that here) + an Uptone USPCB. The difference vs plugging directly onto the host is totally evident: voicing is furtherly open, detailed, imaged. I’ll soon finalise my switch from the laptop onto a Linux based box to furtherly improve the upstream quality (iUSB3 is a nice filter, but it’s always better having less dirt to filter out in the first place isn’t it).

Surely, additional infrastructural elements as a better PS, some competent USB reclocker etc will add to the total cost. Again, if the comparison reference is mainstream chifi DAC or DAC-AMP none of that is needed: Apogee Groove will run circles around those “as-is”. Integrating Apogee Groove with additional infrastructural elements serves the purpose of making it “clinge to” much upper-tier (i.e. way more expensive alternatives).

As an AMP: here’s where it gets tricky

First time I plugged my E4000 into Groove I had a sort of jaw-dropping reaction. That was unlike any other source I ever tried. Most of this was surely coming from Groove’s DAC capacities, but how much did the AMP part contribute on that?

What I did was of course trying to plug all amps I had, or I could get (on loaner for reviews, from friends… I won’t make a list here) downstream and try and find differences. Basically: not a single sub 200$ amplifier I tried on there made Groove’s native output into E4000 better. Most of them (as a matter of facts: all of them except just one) reduced dynamics, made stage smaller or flatter, or compressed the range – read: they are less clean.

My amp sensei taught me that “amps don’t add to dacs – they can only take away, if they are not clean enough”.

The key amp job is leaving a DAC’s voice unmodified while properly feeding the load the odd way it sometimes requires – otherwise it will be the load i.e. the headphone/IEM to ruin the DAC’s work in its turn.

My first E4000-based test was simply telling me that Groove’s built-in amp stage is (sometimes dramatically) cleaner than all external amps I have at hand, while at the same time capable enough to optimally bias its transducers.

Why did this happen? And will this be “always” the case?

Apogee Groove’s amp stage uses a current gain IC in its main circuit and according to Apogee the whole amp shapes the current waveform, aiming at keeping that stable, unlike what traditional amps do, which is shaping the voltage waveform instead.

They call it Constant Current Drive^tm technology, and – to paraphrase Steve Jobs – “boy did they patent it !”. They are not even keen on talking or explaining its details – it’s indeed “not so clear” how exactly Apogee Groove does what it actually does.

Be as it may, Groove’s output promises to sound very coherent in virtually all supported situations, no matter how “restless” the load impedance is.

Another quite surprising feature is Apogee Groove’s uncommonly high output impedance: 20 Ohm.

Such is welcome of course when plugging high impedance cans, while it is in general a serious hurdle when pairing lower impedance earphones or IEMs, which would “sound bad” in such situation. Groove offers you to forget the “8X impedance rule”.

Summarising: Apogee Groove won’t incur into FR-skewing effect when driving low impedance loads, or higher impedance ones featuring wild impedance swings (HD800, anyone?).

“Wow. So… Groove is the ultimate amp, all good, all fantastic?”

No. Groove’s amp stage has two quite significant limitations, and a third partial one.

First: depending on load requirements Apogee Groove may, and will, lack power.

Apogee Groove takes power from the USB2 line (supports USB3 if need be), and more precisely absorbs a maximum of 340mA from there, while on the output side it delivers 40mW and a bit more than 5V (!!) into 600 Ohm.

With that, beasts like HD800 (300 Ohm 102 dB), or HD650 (300 Ohm, 103 dB) will be perfectly supported as they welcome / require as high voltage as possible – and 5V starts to be “a pretty bit” – but absorb very little current, and Apogee Groove’s unique capability to cope with wide load impedance swings does the rest.

On the flip side, Groove falls short when paired with the like of Shure SRH1540. That’s because relatively low impedance & low sensitivity headphones require little voltage but a lot of current, and Groove simply won’t have enough (like all of its direct competitors by the way, but that’s another story).

Second: Apogee Groove won’t support all crossover setups.

In Apogee’s own words: “Apogee does not recommend the Apogee Groove for use with multi-driver balanced armature in-ear monitors. Due to the design of the balanced armature drivers and crossover networks used in this type of headphone, the Groove’s Constant Current Drive amplifier technology may result in uneven frequency response when used with certain models.”

Apogee Groove’s very technology aimed at automatically compensating for impedance mismatches and misalignments is at the origin of this (a crossover filter is working on capacitive components!…).

No harm to the circuits will happen when trying, they will just sound “bad”, not coherent. Shuoer Tape, Oriveti OH500 are examples.

Luckily, not all multidriver IEMs include filters: final B1 and B3 for example do not – and in facts are perfectly supported by Apogee Groove, as the disclaimer does not even apply to them in the first place really.

And even more luckily, to my direct experience a few crossover-equipped multidrivers do nonetheless work properly even on Apogee Groove’s unique amp stage: Ikko OH10, KBear Lark, Intime Sora 2 are all examples of this.

However the main message stands: for multidriver IEMs we can’t rely on Groove’s internal amp stage. Apogee told us crystal clear their technology doesn’t take responsibility for this.

The main way around the issue in employing a separate downstream amplifier of course. Again, be ready to spend some money for it to avoid depleting on other aspects of the output.

What also in some case works is adding an impedance adapter on Groove’s output. I am not 100% sure as to “why” exactly this works but it does. I suspect in such case Groove “sees” a stable full-resistive load, and does not engage in trying to compensate impedance variations.

Third and last: odd limitations on some (few) specific drivers.

Groove’s technology allowing for “8X rule disregard” does work like magic… almost always.

To just toss some examples, I auditioned final E3000, A3000 and E4000, or Tanchjim Oxygen on “quite a few” (!) sources.

If I consider mobile / transportable devices (DAPs, DAC/AMPs), Apogee Groove beats them all on DAC performance grounds, and is the best overall source (i.e., including the AMP stage) with the sole possible exception of Lotoo Paw Gold Touch (but it’s debateable, really). Which is twice as suriprising if I consider Groove’s native output impedance. Virtually impossible is also to find a better alternative looking amongst desktop class devices, but that’s logical as those are primarily designed for overears – typically requiring optimal voltage vs current modulation.

On the other hand, drivers like Koss KPH30i (60 Ohm 101 dB) paired to Apogee Groove present a very modest yet audible mid-bass bump – typical of an impedance mismatch situation. And in facts applying an impedance adapter (e.g. an iFi iEMatch, or equivalent) solves the problem.

Why exactly Apogee Groove can “perfectly manage” even lower impedance drivers, and doesn’t entirely support KPH30i is frankly still obscure to me. May be some specialty on KPH30i tuning? Difficult for me to say.

I might mention another “imperfect support” example, which is final E5000. But my extended experience with those taught me it’s them to be enigmatic. It’s simply not honest to take them as a benchmark for a source “normality” – if something, the other way around indeed!

At-a-glance Card

Conclusion

Besides simply “sounding incredibly better” than anything I had tried before, from the day I got it Apogee Groove has been extremely educational for me as it represented my affordable opportunity to hear and understand superior-tier sound quality.

There’s no going back for me: lower quality reconstruction filters, lack of spatial depth, and fuzzy or at best approximate imaging and layering are something I just don’t have a single reason to bear anymore.

As I tried to describe, there ain’t such thing as a Graal. Apogee Groove, too, has its limits. No direct DSD support is one, and USB2 (24 bit 192 KHz) maximum PCM resolution is another. It also lacks MQA support but that’s never been nor will be any of my concern. Also, the need to “help out” its built-in amp stage to cope with some specific loads turned out to be less of an issue for me than it appeared initially (ymmv).

Anyhow, Groove is so good that not only I adopted it as my core infrastructure on both my home stacks (yes, I bought a second unit after the first) but I even started modulating the rest of my gear relative to it, instead of the other way around. This is fundamentally due to budget restrictions: an headphone amplifier which is “clean enough” to hold true to Groove’s output, while offering appropriate power modulation for this or that driver which is not perfectly biased by Groove directly is no toy.

So I started to reason as follows: does a driver I like work perfectly on Groove? Does it even scale up with Groove? It’s a keeper! Does it not? Better be a really outstanding piece of gear! E.g.: SRH1540 – those are so good as to justify an adequate amp stage just for them, even if it’ll end up costing no way less than 350$ (eyeing a Jotunheim 2 as a minimum acceptable quality stadard at the moment).

That’s what I mean for “game change”: Apogee Groove flipped my perspective.

This is actually a general concept indeed, and a general recommendation. Who is keen on getting the best sound quality into his ears often gives priority to drivers (headphones / IEMs – it seems logical as they are the bits producing the actual sound, right?), then AMPs (as they are those supposed to “feed” the drivers well), keeping DACs last, and not even considering where does digital music come from (the player, a.k.a. “transport”).

The above paradigm is totally wrong. DAC first. Always. The DAC is the voice. Amping me as I sing totally off-key is pointless believe me. Same with a crappy DAC. Get a good DAC. The best your budget can buy. At the same time, make sure the DAC isn’t sent too much crap (i.e. spend money on the transport). Only then you are ready to define your budget for an AMP, and finally you will know which drivers you can choose.

I didn’t mention Groove’s price. Guess. Then open the last spoiler.

Even factoring the extra cost in for an iEMatch to keep at hand and use for this or that odd-behaving IEM – which I learnt is needed with just about any desktop-class amp anyway – I solidly put Groove’s price in no-brainer territory for the quality it delivers.

Final disclaimer: My Groove devices are my own property since day one, have not been supplied as loaners or any other sampling form.

This article also appears on my personal audio site, here.

Our generic standard disclaimer.

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

The post Apogee Groove Review – Changing The Budget Game For Good (since 2015) appeared first on Audio Reviews.

With this question I approached an ifi nano iDSD BL USB DAC-AMP, and this article is about how it went for me.

Input

nano iDSD BL is a USB DAC-AMP, and more precisely USB is its sole input. No SPDIF digital input option, nor analogue inputs or any kind by that matter (aka: the device can’t be used as a mere amp).

Like all USB DAC-AMPs it can be plugged onto just about any USB-capable source such as a PC a Laptop a phone or a tablet, and it will be “seen” as an audio card. Full Windows 10 support requires a driver, which is freely downloadable from ifi’s site.

Nano iDSD BL’s USB 2.0 digital input connector is quite uncommon: it’s actually a USB A male installed in a recess of the chassis’ back panel. Due to that, the cable to connect to the nano iDSD BL needs to have a Female (!) USB A termination on the device end, in lieu of the usual Male one.

A few USB OTG cables with different terminations are bundled within the package. (Ah by the way… if you don’t know what OTG technically means, read here. You might discover why that otherwise good cable of yours refuses to work with your phone…)

• USB-A Female to USB3.0-A Male, 1m long, usually good to connect to a PC
• USB-A Female to USB-C Male, 15cm long, good to connect to a PC or a phone or other transports
• USB-A Female to USB-B Female, 15cm long
• USB-A Female to USB-B Female adapter (same as above, but no short cable in the middle)

No Apple cable is supplied – Lightning or 30-pin – so that’ll have to be purchased separately if needed. Neither is a micro-USB adapter (or cable) supplied, useful to hook onto non last-gen phones and tablets.

Boring cabling apart, something of paramount importance is behind the USB input port: nano iDSD BL incorporates most of the features offered by ifi iPurifier3, the company’s standalone USB “cleanser” which takes care of reclocking, rebalancing and regenerating the USB signal on the fly.

Especially when connecting to noisy hosts like a PC or a Laptop the sound quality improvement is totally apparent and, at least in my experience, the sole reason not to employ an iPurifier3, a galvanic separator, and a cleaner power supply on the input gates of a good DAC is their relatively high cost – which indeed in the case of a budget DAC can easily exceed its price… even a few times over.

According to nano iDSD BL literature and some answers I got from their tech people, the device includes the same REBalancer as the original iPurifier, together with some additional USB buffering circuitry (market-named “Zero Jitter”) which pursues the same ends of the REClocking part inside iPurifier3. Considering an iPurifier3 is separately sold for € 130+, including many of its functionalities inside the nano iDSD BL (€ 230-ish) is a great value proposition.

Outputs

On the output side, nano iDSD BL has 3 ports: two 3.5mm females are on the front panel, one labelled “Direct” the other “iEMatch”, and the third one – on the back panel – is a 3.5mm Line Out.

The font panel “Direct” port unassumingly presents itself like just any single-ended analogue output port, and indeed it does work as such when you plug a 3.5mm single-ended terminated IEM or Headphone cable on it.

Direct output specs are quite interesting:

• Output impedance is nicely lower than 1 Ω
• Supported load impedances range from 15 Ω to a whopping 600 Ω – an uncommonly extended range on this price bracket, especially on the high end.
• Output power is not bad: 20mW (> 3.5V) @ 600 Ω load, 285mW (> 2.9V) @ 30 Ω load and 200mW (> 1.7V) @ 15 Ω Load.
• The declared system dynamic range is > 109dB (@3V) and THD+N is listed as <0.005% (-86dB).

While both latest values are not particularly impressive, they are definitely in-line with the product price bracket and it’s also worth noting that thanks to the above-mentioned built-in “purification” features nano iDSD BL will do its job on an “apriori less noisy” digital signal. This made me expect better results than what printed numbers say and as I’ll report later I was kinda right.

Two very important additional things are now to be noted about output.

First: the iEMatch port.

Inside nano iDSD BL ifi put a modified iEMatch circuit, offering non user-selectable -16dB attenuation and 4Ω output impedance. Is it as effective as the standalone version? Let’s see:

1. As for reducing noise floor (hiss) audibility on extra sensitive IEMs the benefit is entirely there: -16dB is quite bearable attenuation vs nano iDSD BL’s max power so yes it’s well calibrated, it works big time. Indeed, I just recently used it to tame hiss from possibly the “hissiest” IEM I ever auditioned: TRN BA8 – which I wrote about here.
2. As for maximising resolution connected with digital-domain volume control : no, you don’t get that from nano iDSD BL’s iEMatch port… for the simple reason that nano iDSD BL already has analogue volume control (a feature normally implemented on higher tier models). iEMatch can’t “fix” what is not broke in the first place
3. As, finally, for impedance matching… well, I have my doubts here. 4Ω output impedance is… if you ask me not low at all when it comes to managing extra-low (<16Ω) impedance IEMs, and anyhow it’s more than 4 times higher than the Direct port’s own impedance, declared at <1Ω. Penon Sphere (6 Ω) does in fact sound more open, un-veiled and simply “better” on the Direct port vs. on the iEMatch port.

Synthetically: nano iDSD BL’s “iEMatch output port” is nice to have, although just for reducing / removing hiss from too-sensitive IEMs.

Second: S-Balanced wiring.

Many non-entry-level budget-tier balanced-scheme source devices offer both headphone output options, via two separate ports: one for balance-ended cables, the other for single-ended cables.

Ifi adopted a smart in-between option called “S-Balanced” (short for “Single-ended compatible Balanced”). Refer to their own whitepaper for a nice technical description. It is included in ifi Pro iCAN, xCAN, xDSD and nano iDSD BL.

As a consequence, instead of the usual dual separated output ports on the chassis, a cabling scheme is put in place behind the 3.5mm phone port on nano iDSD BL :

• When plugging 3.5mm TRS plugs – aka the ordinary 3.5 male connectors found at the end of 99.9% budget fixed-cable IEMs, and modular single-ended cables alike – the port delivers “normal” single-ended output. All single ended drivers on the market will seemlessly work in there. In addition to that, thanks to how internal cabling is designed, they will also get 50% reduced crosstalk – for free.
• When plugging 3.5mm TRRS plugs, aka “Hifiman 3.5mm standard” (see here) – the port delivers full “balanced-ended” output to balanced-cabled drivers, resulting in quite apparently cleaner and more dynamic sound.
  3.5mm TRRS termination is very uncommon on today’s balanced IEMs and Headphones, so I needed to procure myself an adapter to exploit that (and you won’t be lucky enough to already have one in your drawer either, I’m afraid).

This is nice as it delivers full balanced-ended quality, and even improves single-ended quality a little bit, while keeping full backwards compatibility, all without requiring further faceplate space for an extra female connector.

Add that such dual-standard “trick” is applied both behind the Direct and the iEMatch port, too !

On the flip side, I find it odd that no 3.5 TRRS adapter is included inside nano iDSD BL’s box. Ok maybe I shouldn’t expect one to be bundled for free, but why none is available as an orderable SKU# from ifi ?

Other features

Nano iDSD BL supports a wide range of digital input formats and moreover resolutions: DSD up to 256, PCM up to 384KHz and – drumroll here – MQA up to 192KHz.

I’m not at all interested into MQA so I’m not going to assess that – and even if I did I would have zero comparative experience to rely on.

On the back panel a small switch also allows the user to choose between two filters labelled “Listen” and “Measure”. The Listen option enables a Minimum Phase bezier filter, while the Measure option switches to a Linear Phase Transient-Aligned filter.

The topic may become too technical but let me try to simplify: a Minimum Phase filter makes sound “behave” more closely to our human auditory system – which is incapable of perceiving vibrations before an impulse, and tends to like when those following it over time are smoother – and is therefore by many called “more musical”. A Linear Phase filter yields a little bit edgier notes, which is indeed preferred by a population of listeners, but most of all comes handy when submitting the device to sampling and measuring, hence its given label name (“Measure”).

One more very important note is deserved about available firmware versions and their differences.

When I acquired it, my nano iDSD BL unit carried the latest available fw, version 5.3c. I looked into possible firmware variations and I found something quite interesting, as follows:

As you can read on ifi’s PDF paper linked above, Gibb’s Transient Optimised (GTO) filter is supposed to be an upgrade to the previous Minimum Phase Filter. There’s much more to it, read the paper

Long story short again: by downgrading from 5.3c to 5.3, thus going back to the “original” Minimum and Linear Phase filters and their upsampling algorithms I perceive a distinct sound output improvement! May be a matter of tastes of course, or maybe related to the GTO upsampling being less refined (yet) than its predecessors. Be as it may, to me it sounds better, and I settled to 5.3.

Lastly, the form factor is not “ultrasmall” nor “ultrathin” but it stays very easily transportable, and pocketable – at least in terms of coat pockets. With a little intention it can be “paired” with another device, also exploiting the 2 rubber bands found in the box. Weight is also quite light (139g) and the 1200mAh battery offers up to 10h of theoretical life, which I could test down to 7-8hrs max which is good in its class.

How does it sound…

After all these structural descriptions it’s finally time to go back to the prologue and assess how this light (also quite money-wise) device performs in terms of sound output.

…as a DAC-AMP ?

Much like in virtually all other cases I encountered, true-balanced output is better than single ended on nano iDSD BL too. Once the 3.5 trrs adapter riddle gets sorted, using nano iDSD BL’s true-balanced features is a strong recommendation: soundstage, imaging and most of all dynamics get significantly better.

Even on its balanced Direct output nano iDSD BL’s general tonality is warm, and timbre is dark-ish. Bass is well bodied in positive, yet relatively slow in negative, this predominantly resulting in some bleeding into the mids. Trebles lack some sparkle, not a masterpiece but better than the bass. Range extension is by-laterally, deifinitely on par with devices on this price bracket at least as far as my experience goes. Soundstage and imaging are on the average mark for the price.

…as a DAC, with another AMP ?

Nano iDSD BL’s Line Out port offers surprising better quality.

Plugging the amazing little amp that I use as my “hyperportable transparency reference” (iBasso T3) in, nano iDSD BL’s sound presentation changes dramatically: “darkness” goes away and the general timbre becomes definitely neutral, tonality keeps a modest, possibly welcome warmth, treble suddenly becomes airy and unoffensively sparkly. Clarity goes up 2 notches, soundstage gets airier, separation gets much better too. By the way: T3 is single-ended only!

So putting it simply: nano iDSD BL internal amp does not seem to offer justice to the quality of its dac, which in facts seems capable to kick much above its weight.

…(unfairly) compared to the Mojo ?

I started the day asking myself if this device could hold a candle to Mojo sound-wise though. How about that? Simply put: as a standalone unit the answer is “not by a mile”, while as a DAC to be complemented by a decent (or even good, why not) external amp the score changes quite a bit.

Compared to nano iDSD BL’s Direct full-balanced output Mojo’s output wins hands down an all counts: bilateral extension, bass and treble control, clarity, soundstage, imaging. It simply partakes to a higher class, full stop.

Escaping from nano iDSD BL’s internal amp via the LO port, and adopting an even inexpensive amp as the above mentioned iBasso T3, the gap reduces big time. Mojo still wins by definition, extension and its outstanding (unique in its bracket, possibly) capacity to manage background voices with incredible clarity, but the timbres and tonalities become at least comparable, in the same ballpark so to say.

…or vs to other “more in-line” alternatives ?

Ok nano iDSD BL is not a Mojo. Where does it stand then ?

Let’s run another head to head comparison: Fiio BTR5 DAC/AMP.

The two devices are apriori not really equivalent in terms of intended use, and features: BTR5 is indeed marketed as a BT DAC-AMP for IEMs mainly, with some complimentary USB connectivity but that’s all, nano iDSD BL as an easily portable USB device supporting MQA, higher DSD and PCM resolutions, and high impedance cans. Still, BTR5 gained vast market appreciation in terms of high-sound-quality-for-its-price, and being its price roughly 40% less than nano iDSD BL’s I’m stimulated to compare the two, using BTR5 as a USB device in this case of course.

Compared to nano iDSD BL, BTR5 bass is less bodied (but also less bleeding), mids and highmids come up much less controlled, grainy, and raising volume makes them edge quite quickly. Stage on BTR5 is evidently narrower, imaging is more congested, instruments come accross less defined and separated. BTR5’s dynamics, while not bad per se, are also a notch below nano iDSD BL’s.

Such comparison refers to both devices’ balanced outputs by the way, using a pair of TIN T4 as IEMs.

Let me try another comparison I have at easy hand: my ol’ Fiio X3 mk-III.

I find it interesting as a comparison as I’ll be using X3 as a standalone device, not connected to my PC and therefore apriori unaffected by USB noise. As X3’s balanced output is – as an exception to what commonly happens – not really better then its single ended one, I’ll run this comparison on both devices’ single ended channels for a change. I’ll use a pair of final E1000 as supremely neutral drivers.

X3 comes out as a further bit warmer (nano iDSD BL’s SE already being such), and its trebles are even less extended – which on the up side makes it nigh-impossible to make X3 go edgy let alone screamy. X3’s soundstage is also a bit less extended, imaging is on par. Simply put: the two devices’ single ended phone out are definitely comparable in terms of overall quality.

Now let’s compare the two devices’ Line Outs – always with the help of my iBasso T3.

X3’s tonality stays almost unmodified, trebles become just a little bit edgier but it’s a nuance; soundstage, imaging and separation get better.

On the other hand, as previously noted, nano iDSD BL gets much better when its LO is exploited: bass is cleaner and faster, bleeding is very modest, treble still unextended but much airier, detailed and engaging, soundstage and separation get 2 notches up.

Winding down

Alas!… ifi nano iDSD BL does not sound on par with Mojo, costing 2.5X more. Is it really a problem? Of course not.

Its phone output quality, especially on the full-balanced side, is in line with its price bracket, and offers the significant extra advantage of the built-in iEMatch circuitry proving decisive to cope with extrasensitive IEMs hiss, paired with direct support – and enough muscle power – for 600 Ohm headphone on the opposite end.

Its DAC – taken alone – is more than good, I’d call it outstanding actually. Its reconstruction quality is not so easy to find at this price in a semi-pocketable device. Those – like me – who want to pull the max out of nano iDSD BL in terms of sound quality will pair it with a portable amp, and will get a very significant device for a quite affordable overall price.

At-a-glance card

A final, quick PS: the unit I am talking about is my own property, it has not been provided as a review unit.

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Cons — No (affordable) linear power supply offered as add-on; learning curve; awkward operation with 2 hands; bluetooth module not yet implemented.

EXECUTIVE SUMMARY

The Khadas Tone2 Pro is an innovative miniature desktop dac with integrated headphone amplifier that offers a ton of functionality qualifying it as a competent “Jack of All Trades”.

INTRODUCTION

Khadas is a Shenzen company run by a team of audio enthusiasts. Their first release was the infamous “Toneboard”, a $99 dac/amp that came “naked” without housing. Much of the company’s inventory caters to electronics junkies with soldering skills.

DISTINCTIVE FEATURES OF THE KHADAS TONE2 PRO

The Khadas Ton2 ProPro is a miniature integrated dac-amp that works with Window and Mac computers as well as with Android and iOS devices. It shares certain features with traditional dongles such as the EarMen Sparrow or DragonFly Cobalt in that it is connected to a phone or computer via USB. But a dongle relies entirely on the power of its source and only outputs into 2.5 mm/3.5 mm/4.4 mm audio. The Khadas Tone2 Pro can be powered by its audio source or independently, and has more output options/possibilities than a dongle. It shows, however, less flexibility when connected to a phone because it needs an external power supply in this setup.

The Khadas Tone2 Pro’s distinctive features are:

• Unique encoder knob
• Flexible power supply options (source device or linear power supply)
• Balanced RCA connectors (cable available from Khadas; backwards compatible for connecting a single-ended headphone amp)
• Reversible S/PDIF coaxial input/output (for connecting a CD player or use as USB to coax converter)
• 4.4 mm balanced headphone socket (plus single-ended 3.5 mm socket)
• Add-on bluetooth module (still being developed)

SPECIFICATIONS

Khadas lists the Tone2 Pro’s full specs in every detail; they can be downloaded here. The most important ones are:

DAC chipset: ESS ES9038Q2M 32-Bit Stereo Mobile Audio DAC
Amplifier chipsets: I/V Stage: TI OPA1612 x2, LPF Stage: TI OPA1612 x2, Buffer Stage: RT6863D x3
Output Impedance: <0.3 Ω
SNR: 119-121 dB (depending on output)
Up to 32bit 384KHz sample rate, bit-perfect DSD512, and -118dB THD+N (line-out).
MQA decoding
Compatibility: Windows/Mac, Android, iOS

Maximum output, single-ended circuit (3.5 mm socket):

• 35.3 mW @ 150 Ω (2.0 Vrms)
• 125 mW @ 32 Ω (2.3 Vrms)
• 114 mW @ 16 Ω (1.35 Vrms)

Maximum output, balanced circuit (4.4 mm socket):

• 83 mW @ 300 Ω (5.0 Vrms)
• 167 mW @ 150 Ω (5.0 Vrms)
• 211 mW @ 32 Ω (2.6 Vrms)
• 123 mW @ 16 Ω (1.4 Vrms)

Full Specifications: https://dl.khadas.com/products/tone2/specs/Khadas_Tone2_Pro_Specs.pdf
Product Page: https://www.khadas.com/tone2pro
Purchase Links: hifigo or amazon
Tested at $199.90

PHYSICAL THINGS AND FUNCTIONALITY

In the box are the actual device, a USB-C to USB-C cable, and the manual. The very small Khadas Tone2 Pro ‘s enclosure and the encoder knob are made of aircraft grade aluminium, with a polycarbonate bottom cover on a soft silicone pad – in order not to scratch the underlying surface.

The manual is pretty confusing when it comes to setup with a computer (Mac is not mentioned at all but it worked just upon plugin), firmware update, and operation, but there are excellent videos available that offer all necessary solutions.

User Manual: https://dl.khadas.com/products/tone2/manual/tone2pro_user_manual.pdf

Firmware Upgrade: https://www.youtube.com/watch?v=qRswdL1HPZU

Balanced RCA: https://www.khadas.com/balanced-rca

Khadas Discussion Forum: https://forum.khadas.com

Khadas Facebook Group: https://www.facebook.com/khadas.official

CONNECTIVITY: THE SKY’S YOUR LIMIT

The Khadas Tone2 Pro offers a variety of connections – and therefore a variety of usages.

Inputs: USB-C (computer/phone/raspberry-type single-board computer), I2S (linear power supply, bluetooth module), coaxial (CD-player).

Outputs: 3.5 mm and .4 mm “balanced” headphone sockets (can be used simultaneously), balanced RCA (backward compatible), and the coaxial can be reversed with a firmware change.

INTRODUCING BALANCED RCA

Khadas developed “balanced” RCA connectors which they implemented in their Tone2 Pro. You can connect balanced RCA cables and stream to a balanced amp. While this is a great idea, such cables do not exist yet, and other manufacturers have yet to embrace the balanced RCA technology (but Kadhas sell you a $40 balanced RCA to XLR adapter). No third-party amp with balanced RCA connectors exists presently. Good that these connectors are backward compatible – you can use your old RCA cables.

However, balance amps exist and in order to connete them with the Tone2 Pro, Khadas are selling RCA to XLR adapter. Problem solved…for now. But other manufacturers will have to embrace the balanced RCA technology for the technology to survive.

THE CRAZY VOLUME KNOB IS ALSO A JOYSTICK

Khadas introduce a hybrid digital/analog volume control knob that works like both a normal rotary knob and joystick.

You can turn it like a standard volume knob but also push it sideways…but you need to hold the light device with the other hand during operation…awkward when it is sitting on an amp. Typically each two lateral pushes cycle you through the different modes from volume through track forward/backward, gain, input selection, and digital filter. Here the overview of all modes (from the user manual):

In each mode, you rotate the knob to change the functions as indicated in this graphic. Any setting is visualized by a colour combination in the RGB ring light at the base of the knob. While it is painful to read is, you just watch these two videos to get the details:

PRACTICAL USE OF THE KHADAS TONE2 PRO

In real life, you can use the Khadas Tone2 Pro as follows, for example:

CD player/streamer/computer/tablet/phone –> Khadas Tone2 Pro –> headphone

CD player/streamer/computer/tablet/phone –> Khadas Tone2 Pro –> headphone amp –> headphone

CD player/streamer/computer/table/phone –> Khadas Tone2 Pro –> stereo amp –> loudspeakers

To give you some idea: I first connected the Khadas Tone2 Pro to my computer via USB-C and also used the computer as power source. This was just fine for listening to iems and even the 300 ohm Sennheiser HD 600. I then added power by connecting the Schiit Magni 2 Uber headphone amp via RCA cables. The Khadas Tone2 Pro now served as pre-amp.

I then moved to my stereo system and connected the Khadas Tone2 Pro to my CD player via coaxial RCA. I also connected my phone to the Khadas Tone2 Pro’s USB-C port…and had two music input sources to choose from. I switched between the sources using the rotary function of the dial after having it set to “Input” mode….and listened to CDs with my Sennheiser HD 600 connected to the Khadas Tone2 Pro 3.5 mm socket. I now had to option to use the RCA out to connect the Khadas Tone2 Pro either to a headphone amp or to the stereo’s power amp.

Streaming music from your phone to the Khadas Tone2 Pro via Bluetooth would be an interesting asset. This functionality has not been implemented yet – a add-on Bluetooth module is presently being developed.

SUPPLIED POWER VS POWER SUPPLY

The Khadas Tone2 Pro is driven from the USB-port of your computer without problems. I was told that a notebook is an electrical firestorm and that there is some electrical noise associated with Mains power at 20, 60, and 180 Hz on laptop USB.

The Khadas Tone2 Pro features a second USB-C port (labelled I2S), designed for input from a Linear [Voltage] Power Supply (“LPS”). An LPS supplies a constant current, which minimizes electrical noise and generates ultra-clean signal-to-noise ratios. But I was warned that the “wrong” LPS could make the Khadas Tone2 Pro (and similare devices) “dull and uninspiring” sounding. When in use, I2S prioritizes the LPS over the USB source. Separating data flow and power, and supplying power from a “clean” LPS serves the purpose of improving sound quality. This is particularly important when the Khadas Tone2 Pro is used as dac. Any distortion/impurity in the signal will be exaggerated by the attached power amplifier.

And while an LPS may feed the Khadas Tone2 Pro with “clean” power, this also opens a can or worms.

First, an LPS is expensive. At a minimum, you spend 40% of the Khadas Tone2 Pro’s purchasing price – when you live in North America. In Europe, a quality LPS sets you back 120 EUR. And even if you convert your old microwave into an LPS, it takes $50 in parts. This is cost prohibitive.

Second, these LPS are bulky and heavy, which is contradicting the idea of the Khadas Tone2 Pro’s lightweight and small dimensions. This is less of an issue when don’t locate the LPS on your desk but use it as a kick plate underneath.

Third, the music coming out of the computer’s USB port will still carry impurities.

Khadas failed to design an affordable LPS as an add-on, which I consider a flaw considering all the good ideas that went into the Tone2 Pro. After all, the buyer wants a perfectly functional device out of the box.

So, what are the alternatives? After all, any dac or amp comes with its own power supply – and you don’t have to worry about it – and therefore not pay extra through your nose. I tested a $15 powerbank (stable power supply), Apple stock 5 V chargers for iPhone and ipad (all switched-mode power supplies but of good quality), and two low-noise power supplies provided by ifi Audio (for a separate review). The potential issue with switching currents is electrical noise being introduced to the signal.

First of all, all of the above principally powered the Khadas Tone2 Pro. So the question is whether LPSs are overkill. We will answer this question below.

SOUND IN DIFFERENT APPLICATIONS

My tonal preference and testing practice

My test tracks explained

Equipment used: MacBook Air, iPhone SE (first generation), Marantz SACD8005; Khadas Tone2 Pro, Schiit Magni 2U; KBEAR TRI I3, Shozy Form 1.4, Sennheiser HD 25 and HD 600; ddHifi adapters DJ35AG/DJ44AG; diverse power supplies (ifi Audio iPower & iPower X, Apple iPad 12 W switching power supply, Tzumi 10,000 mAh power bank); Snake Oil Taipan and Radio Shack RCA interconnects; Amazon basics coaxial RCA cable.

Setup 1: Khadas Tone2 Pro with MacBook Air and TRI3 and Shozy Form 1.4 earphones with DJ35AG/DJ44AG adapters

This test served the purpose of comparing the single-ended and balanced circuits using 2.5 mm balanced cables and the DJ35AG/DJ44AG adapters. I used the easily driven Shozy Form 1.4 and the harder-to-drive planar magnetic TRI3 earphones, both on low gain.

The balanced circuit was much superior over the single-ended one in that the sonic experience was much more three dimensional and atmospheric, with a much better spatial cues, more note weight…and it was simply louder. The technicalities were all quite good with one downside: the timbre was rather digital and a bit edgy for the cello sonatas I had started my test off with…and the sound was lively and crisp with rock music, though the bass could have been a bit meatier.

I mentioned it above: both outputs work simultaneously…two can listen.

Setup 2: MacBookAir with Khadas Tone2 Pro and Sennheiser HD 600 headphones

I could only test the “weaker” 3.5 mm single-ended output with the 300 Ω Sennheiser HD 600 headphones…and I was pushing the Khadas Tone2 PRO’s limits (on high gain). I achieved an astounding headroom considering this small device, although the dynamics stayed on the “polite” side. This combination principally worked, but it had reached its limit. I would not push any harder-to-drive headphones.

Setup 3: Marantz SACD8005 with Khadas Tone2 Pro and Sennheiser HD 600 headphone

This experiment served testing the coaxial input from the CD player with uncompressed music. I used a $12 CAD amazon basics coaxial cable that is surprisingly well made. The SACD has its own integrated headphone amplifier so I could A/B from the same source.

This combination sounded quite impressive with lots of headroom and transparency. In comparison, the integrated Marantz headphone amplifier (with unknown but probably high output impedance) sounded somewhat muffled with less extension.

Setup 4: MacBook Air with Khadas Pro into Schiit Magni 2 Uber and Sennheiser HD 600/HD25 headphones

In this setup, the Khadas Tone2 Pro was only used as a dac, with the Schiit as the amp. And it literally rocked. The punch returned to the Senns and so did naturalness. Yes, this combination sounded more natural than the Khadas’s integrated amplifier. Switching from the 300 Ω HD 600 to the 70 Ω HD 25 added some lightness and ease…but this probably has to do with the Schiit’s limited output rather than the T2 Pro.

I also played with cables and compared the sturdy Snake Oil Taipan interconnects (with their German Sommer wire) with some 20-year-old Radio Shack ones. And, compared to the Radio Shack ones, the Snake Oil added…no, not snake oil, but bass, as if a subwoofer had been added. Which one is better comes down to personal taste.

I then replaced the Khadas Tone2 Pro with the Dragonfly Cobalt as dac, which also sounded great but slightly less substantial. This probably lies in the quality of Khadas’s dedicated RCA outputs.

And what did the different power supplies contribute?

I tested the Khadas Pro with the different power supplies (ifi Audio iPower/iPower X, Apple iPad 12W switching supply, Tzumi power bank, Macbook’s USB power), musically sourced by the MacBook. Since the Khadas prioritizes the I2P port (it switches automatically when an external power source is connected), A/B-ing was easy.

What did I expect between Mac power and external power? From discussions and company advertisements/claims, the electric noises should should have been decreased – and the sonic impact should have increased with an external low-noise supply.

What differences did I hear? Absolutely none, zero, zilch. This relates to the Mac as the music source while using the Khadas as amp and as dac in combination with the Schiit amp. I would have expected this for integrated amp, but additionally amplifying the signal with the Schiit should also have further amplified the noise.

I also alternated the external power supplies when playing music from the Marantz SACD player…and could also not hear any differences between them. But I noticed an excellent clarity and headroom, which probably reflected the uncompressed nature of the music compared to the compressed formats on the Mac.

In the end, there were too many unknowns to allow for a conclusive answer on the LPS question other than that an external power supply likely does not make the world or a difference. The cheap compromise would be the power bank.

Talking to audio engineer Amir from Audio Science Reviews (who had also reviewed the Khadas Tone2 Pro), he told me that different power supplies can make a small measurable difference, which are not significant enough to justify their purchase. The Khadas Tone2 Pro’s performance is superb without.

I don’t object.

CONCLUDING REMARKS

The Khadas Tone2 Pro is not only a “Jack of all trades”, it is also a master of many. It incorporates a lot interesting concepts and innovations – and it works by itself or in combination with essentially anything. It has come a long way from the original “naked” Toneboard for the DIY person to this turnkey device that will provide users with lots of fun…after an initial learning curve. A unique product that is uniquely good.

Recommended.

Until next time…keep on listening!

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You find an INDEX of all our dac/amp reviews HERE.

DISCLAIMER

The Khadas Tone2 Pro was kindly provided by hifigo for my review. Thank you very much.

You can get the Khadas Tone2 Pro from hifigo or amazon.

Our generic standard disclaimer.

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

GALLERY

The post Khadas Tone2 Pro Review – Impossible Is Nothing appeared first on Audio Reviews.

Cons — 2.5 mm balanced only/USB-C only limits connectivity on either end.

EXECUTIVE SUMMARY

The Tempotec Sonata BHD is a neutral, sleek, crisp, and transparent sounding 2.5 mm balanced dac/amp that offers a substantial sonic update over phone/computer dacs/amps when used with iems. One of my favourite products in 2021. A personal favourite.

NOTE

I did not test the Sonata BHD with headphones owing to the lack of a balanced cable. Considering its power, the Sonata BHD is much better suited for iems. I also did not test DSD and MQA, as I do not have the required subscriptions. And I think the Sonata BHD is more tailored towards mobile units than towards computers.

INTRODUCTION

Chinese manufacturer Tempotec made quite a dent with their Sonata HD Pro in 2019. At $40, it comes with all possible adapters and you can connect it to essentially everything: Android devices, Apple devices, and computers. Not bad at the price of essentially an Apple lightning adapter. Unsurprisingly, the Sonata HD Pro has been a favourite in terms of audioreviews.org blog views since, made it into my “Gear of the Year 2020“, and remains highly recommended.

The Tempotec Sonata HD Pro features a single-ended output, whereas, in the meantime, companies like Earmen offer two outputs in their Sparrow dongle: 3.5 mm single-ended, and 2.5 mm balanced. And while I thought “balanced” was just another gimmick, it is truly not: everything sounds bigger and clearer with balanced in a direct comparison. But the Earmen Sparrow comes at a price of $200. Tempotec responded to the market’s demand for “balanced” output with their Sonata BHD, a sleek and powerful dongle at $70.

To answer you burning questions right away: does the Sonata BHD sound better than the Sonata HD Pro? Yes, it does. Does it sound as good as the Earmen Sparrow? No, not quite, but it still sounds impressive.

THE IDEA OF BALANCED AUDIO

Balanced audio is a method of connecting audio equipment using balanced lines [Wikipedia]. Such lines reduce susceptibility to external noise caused by electromagnetic interference. This is particularly beneficial for recording studios, which use kilometres of lines. For our purpose of portable audio, reduced interference results in a clearer, cleaner signal. Headphonesty compared “balanced and unbalanced” audio connections in this article.

SPECIFICATIONS

Product Name: Sonata BHD
DAC Chip: Two CS43131
Output Impedance: NA
SNR: 129 dB
HP Out : 120MW/32ohms 20MW/600ohms
Level: 2VRMS
THD+N: -113dB
Crosstalk: greater than 118dB (32 ohms) *
PCM: up to 32bit/384kHz
DSD: to DSD256 (NATIVE) DSD128 (DOP)
Hiby Music APP: Support exclusive
PC: Exclusive ASIO driver
Volume control: independent hardware volume control
Purchase Link: Tempotec Official Store

Tested at: $66

PHYSICAL THINGS AND USABILITY

The Sonata BHD comes with a fixed USB-C cable, a USB-C female to USB-A adapter, and a pleather case. It does not feature the detachable cables of the Tempotec Sonata HD and is aiming to be connected to USB-C and USB-A devices such as Android phones, and Windows and Mac computers. It can be connected to iPhones/iPads using either the Apple camera adapter or the much sleeker ddHifi TC28i adapter. Therefore, adding a third-party adapter makes the Sonata BHD as versatile as the Sonata HD Pro with source devices.

In terms of dimensions, the Sonata BHD is slimmer and higher than most dongles. And like the Sonata HD Pro, the housing is made of metal with rather sharp corners. Tempotec increased the often criticized spacing between the two volume buttons compared to the Sonata HD Pro – what they have not addressed is the volume steps when pushing the buttons (which are identical to the source’s volume buttons). The button mechanism is exquisite and precise – with a great soft rebound – so that is is almost fun pushing them. All connections and connectors work precisely, too.

Internally, the Sonata BHD features the same chip as the Sonata HD Pro, however TWO of them (one for each line), which explains the price difference.

FUNCTIONALITY

The Tempotec Sonata BHD has no internal battery and is driven by the music source. This is great in that there is no planned obsolescence (the device will still work in, let’s say, 10 years), but it drains your mobile source faster. As to the drain rate, I did not explicitly test it – but battery consumption appeared to be within reason.

The Sonata BHD is plug ‘n’ play with phones and tablets, and it requires selecting the device in my Mac’s sound panel (probably similar in Windows).

When playing, the Sonata BHD relies on the source volume. I typically set the computer/phone volume at 80%, although I am not sure whether I can turn it up to 100% without (more) distortion. After removing the Sonata BHD from my phone, it recognizes the volume setting upon reconnecting.

AMPLIFICATION

There is a paradox: a balanced output is typically more powerful than a single-ended output – and iems, on average, require less power than headphones: however balanced cables for headphones are harder to get and more expensive than for earphones. As a rule of thumb, external amplification is needed for headphones/iems with an impedance above 50 Ω. While most headphones exceed this number, most iems run at 32 Ω or lower. Iems above 50 Ω typically feature electrostatic or piezoelectric drivers. I don’t have any balanced-headphone cables but could test the Sonata BHD with power-hungry iems such as the Vision Ears Elysium, Triaudio I3, and NiceHCK NX7 Mk3. And they were all driven very well by the Sonata BHD.

I could not test the Sonata BHD with headphones – I don’t have one with a 2.5 mm cable – but was told it is not that powerful. I would therefore be careful with any headphone above an impedance of 70 Ω.

As to specs, the Sonata BHD delivers 120 mW into 32 Ω (and 20 mW into 600 Ω). This is twice as much as the original Sonata HD Pro offers.

TONALITY AND TECHNICALITIES

My tonal preference and testing practice

My test tracks explained

Equipment used: iPhone SE (1st generation) and MacBook Air; various earphones, mainly the Shozy Form 1.4.

The Tempotec Sonata BHD is a strictly neutral and sleek but never sterile or over-analytical sounding dac/amp that enhances the sound characteristics of the attached earphone/headphone. It is not only useful for running power-hungry earphone/headphones, it also improves the sound of easy-to-drive iems. Let’s take, for example, the excellent sounding, well reviewed Apple Audio Adapter that works well with my 16 Ω Shozy Form 1.4 iems. The Tempotec Sonata BHD simply adds midrange clarity and definition, opens up the soundstage, and increases headroom. And it adds pizaz to the sound…yep, it is rather punchy. These improvements over my phone are quite pronounced – and much bigger than with the Tempotec Sonata HD Pro.

Replacing the Tempotec HD Pro with the Tempotec Sonata BHD is like adding sour cream to your gravy: smoother, better balance, much bigger stage, better three-dimensionality, the sound is simply more appealing. Connecting my >50 Ω earphones added body, cleanliness, and smoothness on top of power.

WHO NEEDS THE SONATA BHD?

IMO, the Sonata BHD serves two specific purposes:

• Play power hungry iems (such with an impedance of > 50 ohm)
• Improve the sound quality of any iem, even at low volumes

First, there should be no problem playing a, let’s say, 70 Ω headphone such as the Sennheiser HD 25 with the Sonata, however it may be cost prohibitive to get a 2.5 mm balanced cable for headphones. Second, the Sonata BHD is not an ornament as so many other dongles. Any earphone sounds better on my iphone with the Sonata BHD compared to the Apple Audio Adapter or the ddHifi TC25i adapter (which is technically and sonically essentially identical with the Apple Audio Adapter). In comparison, the Sonata BHD adds clarity and definition, slims down the sound, and opens up the stage including headroom.

But I doubt that you will be able to drive full-sized 300 Ω cans with the Sonata BHD well.

TEMPOTEC SONATA BHD COMPARED

As said before, the Tempotec Sonata BHD upgrades the sound of the Apple Audio Adapter as well as their own Tempotec Sonata HD single-ended dongle. It does, however, not live up to the balanced circuit of the $200 EarMen Sparrow that excels in its more analog, fuller sound with an even better headroom. Nevertheless do I like both for their merits and one cannot replace the other. Similar to the different models in my earphone collection, both dongles hits different moods of the listener and I really enjoy them both very much.

CONCLUDING REMARKS

The Sonata BHD provides a huge sonic upgrade to your phone and is another winner from Tempotec. Is sounds better and is more powerful than their famous Sonata HD Pro, but is a bit more limited by its ootb connectivity. Adding a second dac chip has increased the price, which benefits the sound greatly. The Sonata BHD is not only good for amplification but also for improved the sound quality of easy-to-drive earphones and headphones. It is not an ornament as so many others. Once again, a superb device and great bang for your buck. As simple as that…I said it before.

Until next time…keep on listening!

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DISCLAIMER

The Tempotec Sonata BHD dac/amp was provided by Tempotec upon my request. Thank you very much. You can buy it at the Tempotec Official Store.

Our generic standard disclaimer.

About my measurements.

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

PHOTOS..

The post Tempotec Sonata BHD Headphone Amplifier (Dual CS43131 Balanced Output) Review – Snakebite appeared first on Audio Reviews.

EXECUTIVE SUMMARY

The EarMen Sparrow is a $200 battery-less warm-neutral sounding dac/amp with dual output: single ended 3.5mm and the more powerful 2.5 mm balanced. It is class leading in terms of both power and sound quality. The EarMen Sparrow supports playback from iPhones, Android smartphones, MacOS and Windows computers. It also plays all 32bit/384kHz formats: PCM, DoP, DSD64, DSD128 and MQA. It is the best dongle I have come across (in the $200 category) and was on my personal favourite gear list of 2020.

INTRODUCTION

Do all dongles sound equal? Are most dongles just ornaments? Should we rather go for a desktop dac/amp instead to get more value for money? All of the above have been mentioned in discussions lately. For years I have had a single dongle dac/amp, the Audioquest Dragonfly Black. I mainly used it with my iPhone and life was good. Until…

To make this clear a priori: the EarMen Sparrow is the best-sounding dongle I have tested too far…but also the most expensive one. And it is not an ornament.

EarMen is a company registered in in the US, where most of its stakeholders are located – and from where they focus on the North American market. EarMen are a subdivision of premium audio gear producer Auris Audio. The production is in Krusavec, Serbia [video of production facilities]: Made in Europe.

SPECIFICATIONS

Dimensions: 42*22*8 mm

Purchase Link: EarMen Shop

PHYSICAL THINGS AND USABILITY

In the box is the EarMen Sparrow, the warranty card, and two cables: USB-C to USB-C, and USB-C to USB-A. This allows the Sparrow to connect to Android phones/tablets, and any Windows/Mac computer. It features the ESS Sabre ES9281PRO dac chip – which is well implemented.

The EarMen Sparrow also works with iOS devices but requires the Apple Camera Adapter, which adds to a “monster snake”. The $30 ddHifi TC28i adapter offers the same funcionality but cuts the snake’s length enormously.

The actual EarMen Sparrow is a sturdy and filigree CnC machined aluminium construction with top and bottom covered by glass…although I wished it had come with a sheath to protect it from being scratched.

In contrast to most other dongles does the EarMen Sparrow offers two different circuits and sockets: a single-ended output through a standard 3.5 mm socket and a balanced output through a 2.5 mm socket. Both outputs/sockets work simultaneously. And it is the balanced output that makes the EarMen Sparrow particularly attractive.

The logo is illuminated depending on input:

• White – Connected
• Green – PCM/DXD/DSD
• Magenta – MQA
• Red – Not Connected

THE IDEA OF BALANCED AUDIO 

Balanced audio is a method of connecting audio equipment using balanced lines [Wikipedia]. Such lines reduce susceptibility to external noise caused by electromagnetic interference. This is particularly beneficial for recording studios, which use kilometres of lines. For our purpose of portable audio, reduced interference results in a clearer, cleaner signal. Headphonesty compared “balanced and unbalanced” audio connections in this article. And yes, it works.

FUNCTIONALITY

The EarMen Sparrow contains no battery and is powered by the source device. It works plug ‘n’ play with computers, tablets, and phones (Windows/Mac/Android/iOS). And it requires adjusting the respective sound panel settings in Mac and Windows computers. Volume is controlled from the source device – there are no buttons on the EarMen Sparrow. It is as easy as that. The EarMen Sparrow decodes all 32bit/384kHz formats: PCM, DoP, DSD64, DSD128 and MQA. 

AMPLIFICATION

The EarMen Sparrow is one of the most powerful dongle dac/amps on the market according to AudioScienceReviews.com. Its 2.5 mm balanced output delivers 2.0 Vrms into 32 Ω and 4.0 Vrms into 600 Ω. This results in a power of 125 mW and 20 mW, respectively. The 3.5 mm single-ended output is 1.4 Vrms into 32 Ω and 2.0 Vrms into 600 Ω, which translates to 61 mW and 7 mW, respectively.

I don’t have a balanced cable for my 300 Ω Sennheiser HD 600 Pro, however the single-ended output drives them “ok”. The balanced circuit delivers enough power to drive the 70 Ω Sennheiser HD 25 on my Mac, which indicates that this is good enough for any iem. In fact, imo the EarMen Sparrow drives even the most power-hungry earphones very well with my Mac.

A bit of an enigma is the dependency of the EarMen Sparrow on my sources: it provides way more power when sourced by my Mac, but appears to be throttled by my iPhones 5s and SE (1st generation). I speculate this is caused by the Sparrow’s power consumption. Sound quality is not compromised and power-hungry earphones such as the TRI I3 are still driven sufficiently well. Newer phones and Android devices may not throttle the EarMen Sparrow’s power. The Sparrow, like most powerful dongles, appears to be a bit of a battery drain on phones.

UPDATE June 2021: 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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TONALITY AND TECHNICALITIES

My tonal preference and testing practice

My test tracks explained

The EarMen Sparrow is a neutral-warm sounding dac/amp (more neutral than warm), and therefore offers the best of both worlds. Whereas a warm dac/amp (such as ifi Audio products) harmonizes best with neutral earphones/headphones (e.g. JVC HA-FDX1, neutral amps (e.g. Earstudio HUD 100) pair best with warm iems (e.g. Sennheiser IE PRO series). Neutral amp with neutral iem may sound like metal on metal – and warm with warm may come across as thick and syrupy lacking clarity and transparency. The EarMen Sparrow appears to strike the right temperature balance to harmonize with most kinds of earphones. The other trait is its good extension in both directions and its full body and natural dynamics. The Sparrow has this quasi-analog sound.

And while the sound through the single-ended output is good, it is fantastic through the balanced output. The difference in sound quality is mindboggling (I A/B-ed a balanced cable between both sockets – with a 2.5 mm female to 3.5 mm male adapter for single ended). Apart from the power gain in the balanced circuit, headroom and clarity opens up substantially…the midrange comes out nicely…this worked even for the ~$3000 Vision Ears Elysium. After several months of using the EarMen Sparrow on my Mac, I conclude that the balanced output is as good as a desktop amp for iems – on a computer.

EARMEN SPARROW COMPARED

The neutral sounding $70 Tempotec Sonata BHD dac/amp with its balanced output is an impressive sounding device. The EarMen Sparrow, however, offers a richer, more analog sound, a larger headroom, and more power. It is also more versatile with its additional 3.5 mm single-ended output. The less powerful Sonata BHD has a leaner, sleeker but less creamy/soft/weighty sound with more clarity.

VALUE – IS THE EARMEN SPARROW FOR YOU?

Is the EarMen Sparrow worth its $200? Any answer has to be subjective. For people who regularly deal with >$300 earphones without blinking: yes, no questions asked. Simply makes them sound better.

For the rest of us: yes, but for any or all of these three specific purposes – from my perspective: for the balanced output that sets the EarMen Sparrow sonically and power wise apart from its competition. Second, it is best used with iems or less power-demanding headphones. And third, for use mainly with a computer, where the Sparrow flexes its muscles best.

CONCLUDING REMARKS

I have used the EarMen Sparrow for a few months now. It took me so long to publish my review because I didn’t know what to write – it just worked great for me, and I used it a lot for earphone testing. The Sparrow is the best sounding dongle I have listened to so far (up to $200), albeit also the most expensive.

What sets it apart from the competition are sound quality and power of its balanced circuit. I don’t think one needs anything “bigger” to drive earphones – it was good enough for the $3000 Vision Ears Elysium. And since it does not have a battery, there is no planned obsolescence – the Sparrow will last for a long long time.

It is the balanced output that makes the Sparrow fly high: first it opens up the headroom and then it makes it a most powerful dongle – ahead of the competition. The EarMen Sparrow is just a very fine dac/amp. One of my favourite devices of 2020…and likely 2021, also. Basta!

Until next time…keep on listening!

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DISCLAIMER

The EarMen Sparrow was provided by EarMen upon my request. I thank them and also the audiofool who had established the contact. The audiofool has reviewed the Earmen Sparrow here.

You can purchase the EarMen Sparrow from the Earmen Shop.

Our generic standard disclaimer.

About my measurements.

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

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