The Sonic Unity Encore mDSD is a USB powered DAC/AMP stick priced at $99 with a host of excellent features including DSD native decoding capability.

Disclaimer: The Sonic Unity Encore mDSD sent to us is a sample in exchange for our honest opinion. We thank the team at Sonic Unity for giving us this opportunity.

You can read up on our previous portable amp/DAC reviews on Headfonics here.

Slide here to add your score on the gear!13 Votes

USB DACs are nothing new to the market and I have only really paid attention to one of them the D3 from AudioEngine last year. Mike swears by his Aegis from Cozoy, others disagree but by and large, my laptop has been a USB stick DAC free experience.

I got what they are about and I understand the iGadget guys can benefit from a greater audio experience than what they currently get right out of their onboard soundcard but apart from the D3 I have felt these sticks do not offer a huge step up to justify getting them as well as the fact DAP’s have a DAC function these days built right in there that can often be superior.

But I could change my mind. Especially when Sonic Unity asked me to try their $99 Encore mDSD stick, which I actually think could be the best yet in terms of sonic reproduction at the ‘stick level’ and certainly the most capable in terms of specs for the price.

What is it?

It looks like a large USB stick and to the uninitiated, you will probably think it is an oversized memory stick. Much like the AudioEngine D3, it packs an audiophile punch as a micro-sized DAC/AMP that is designed to allow you to digitally bypass the rather inferior cacophony of audio from your onboard PC or laptop soundcard.

In doing so, the resulting critical expectation is that it will output a symphony of joyous melody at a much higher bit and/or sample rate and thus you will have a much better audio experience with the headphone of your choice stuck into it. Hurrah!


Unlike other USB DAC sticks though the Encore mDSD decodes at fantastically high rates including 32-bit/384kHz PCM and native DSD 256 decoding which puts it out there almost in a league of its own in terms of future-proofing and reproduction capability compared to the other mere mortal sticks in the market.

Both the D3 and the DragonFly hit the decode ceiling at 24-bit/96kHz so modern hi-res file formats such as PCM and DSD are off the menu. They are also priced at $99 to $149 meaning value-wise on paper the mDSD packs a lot more for the same price or less. Only the LH Labs Geek Out 100/1000/V2 USB DACs, priced at around $200 plus, are capable of DSD and even then its DSD128 as opposed to the mDSD which sails onto DSD256 without stopping to catch its breath.


That being said it is one of the fatter USB DAC sticks out there in the market today. Those with an array of USB ports might not be too fussed on the fact that when plugged in the dimensions of the mDSD case actually prevent any adjacent USB ports from being used by other cables and gadgets such is its girth.

Of course, if you have a single USB port just sitting there then this is not an issue, but for a laptop such as mine, an Alienware then technically I need a USB extension cable to allow maximum use of all my USB ports. Luckily I have such a cable. It is odd how you acquire these things over the years and when they become rather useful.


The casing though is rock-solid aluminum 2 piece joined at the center and feels plenty sturdy. It comes in two colors, black or silver. The silver matches up pretty well to Mac laptops in terms of color coding and the black should do for everyone else. On the bottom, you have 4 small hex key screws holding everything together. The mDSD can also be sold without this case at $69 for those who want to tinker and build something a bit different than what is offered by Sonic Unit as the finished piece.

Everything else is well laid out though minimalist in aesthetics. To the left side, you have two volume control buttons plus and negative labeled and to the bottom, you have the dual 3.5mm/optical jack out. This dual jack I quite like. It makes the mDSD something more than just a standalone closed-circuit DAC/AMP. SPDIF out gives me system connectivity.


The Encore mDSD is not only a DAC it’s also an amp as well as potential system component with SPDIF out, but there is more. It can also connect with iOS and Android devices using the Apple camera connection kit and any USB OTG cable and USB OTG digital audio capable phone. In fact, when speaking to Sonic Unity on this they mentioned that this was the primary aim of the mDSD and what, they hoped, would set it apart even further and that was its high degree of flexibility in connecting to mobile class devices such as iPhones and Android phones.


The mDSD is built around the Sabre ESS 9010K2M DAC chip with XMOS USB chip. I have a warm feeling for this ESS chip. It’s a highly regarded mobile class DAC chip with a stable and low power draw and when implemented well can sound very clear with plenty of detail. Codec decoding is excellent with most lossless and lossy formats including DSD support.

Quite a lot of the audiophile-grade portable DAC products on the market today come equipped with the 9010K2M including the Resonessence Labs Herus and the NuPrime uDSD and at a higher price than the mDSD. The fact it can be stuffed into a $99 DAC speaks volumes for how much prices have dropped now on this chip.

Since the mDSD is not battery powered, instead drawing from the source power supply, Encore has wisely designed the draw from mobile devices to be less than 20mAh, below the max allowable from iOS gadgets and should avoid heavy or fast drainage from your phone or mobile source. That being said, resolution of files, the volume of output and whatever else you are up on your device during playback, can and will affect battery life so this is not a hard and fast rule.

Sound Impressions


Tonally I found the mDSD to be relatively neutral with a hint of low-end warmth and a forgiving but clear top end. It has a decent sense of pace and a full sounding low-end extension. This is not a thin sounding neutral analytical sound. I get a strong sense of musicality from the mDSD that bodes well for my ancient 80’s rock tracks and Queen/Floyd collection. Notes are full bodied but well defined, vocals sound clear with a slightly forward presence and there is plenty of meat in lead and guitar work.

The soundstage is more intimate than arena like but it has decent width and depth. Treble extension is good, notes are clear and detailed with a bit of top end brilliance. You cannot classify the mDSD as having a bright tonality by any stretch of the imagination but it does sound quite natural to me with an engaging and realistic instrumental timbre. It is the kind of tonality that you could work with for long listening sessions with suffering any fatigue but it still sounds weighted enough to get visceral and dynamic when required.


The mDSD has a full sounding low end with above average extension and a mild mid-bass elevation for some added impact. Mind you I do not find the bass performance of the mDSD to be out of whack with the rest of its presentation. It is relatively linear in that respect and rather coherent with decent speed and snap but it’s definitely not lacking and that solidity and decent body are most welcome if your preferred tunes are more Lamb of God than Max Richter.


The lower mid-range of the mDSD is relatively linear to the mDSD’s bass response meaning low-end guitar and bass rhythm work is full sounding and authoritative with a well-defined body. There is a tiny dip just after around 1k but things get elevated again around 3-5k to produce a clear sounding vocal reproduction. Timbre is engaging and accurate, nothing sounds overtly digital and not as congested sounding as the AudioEngine D3 mid-range.

The mDSD is not quite as forgiving as the drier D3 on vocals but sibilance is still very short in supply with the mDSD meaning you get a slightly forward vocal presence with good texture in both male and female vocals but if the recording sucks then the mDSD won’t mask that.

I did prefer vocal work that registered just a bit lower in the mDSD’s signature so in comes Till Lindemann and Steve Lukather and out goes edgier vocals such as Kate Bush. That is not to say female vocals are out, Norah Jones sounded excellent on Little Broken Hearts, so did most of my huskier vocal performers such as Buika. It was really down to a question of preference and husky or meaty vocals seem to win out.


I like how the 9010K2M is tuned here for treble reproduction. I have heard a few iterations of this DAC sounding thin with a bit of top end glare and a harsh attack that gave off what we know as the “Sabre glare”. Whilst it is not a honey dipped syrupy affair I am glad to hear a treble response that has a nice sparkle and touch of brilliance to it but sensibly doesn’t have too much of a peaky feel to it on the lower treble and presence region especially on percussion work. Tuning here allows cymbal work to stay on the right side of splashy but still possessing a nice snap and energy.



Again, as with the D3 previously, the power you can get from the mDSD is quite surprising and yet the efficiency handling is equally competent. Both IEMs and headphones alike can and do sound adequately driven up to a point but that point is a bit further up the chain than you might think.

Efficient headphones such as Grado and the AKG K812 were easy to drive and sounded true to form. In particular, I felt the K812’s brighter more uneven tonality to match well with the more controlled signature of the mDSD. Treble edge went down a notch and the K812 bass was confidently full sounding and planted. Super sensitive IEM’s such as the Shure SE846 and the Campfire Audio Jupiter did not suffer from unduly high noise levels or background noise.

I was especially impressed with the performance on modern planars such as the Ether C. Though not quite scaling as good as a dedicated desktop amp, it never sounded anemic or brittle especially with the bass and low mid-range response which still had very good body indeed. Overall the sound was quite smooth, vocals were very pleasant and it came across as a rather musical little and large pairing.

Final Thoughts

I remarked previously on the AudioEngine D3 review that I was pleasantly surprised by how USB DAC/AMP sticks performed and at $149 I thought it was reasonably good value for money. Well, the mDSD just killed that notion at $99. It is probably the best value stick out there now for codec handling and sound quality. I really like being able to stick this little guy in a laptop or mobile phone and start playing my DSD128 and DSD256 tracks without a hitch. It is amazing how far DSD decoding has come down in price.

The inclusion of the ESS 9010K2M, normally reserved for good quality portable DAC’s is a good move here. Badly worked chips of this kind sound thin, unforgiving with a lower-treble glare. This one doesn’t. It’s a neutral sounding signature with a touch of low-end warmth, solid bass response and a clean and clear vocal presence. Most importantly that treble performance is good without any accompanying irritating peaks.

Power and control are also equally impressive. Noise is absent on highly sensitive IEMs and there is enough power for most mid-tier and modern planars to sound excellent and in the case of planars pretty good for the price. The Ether C hates thin signatures and this isn’t one of them.

If you are in the marketplace for a quick audio upgrade on your PC or mobile phone sound then get the D3 instead of the mDSD. The mDSD is anything but ‘quick’, it’s too good to be defined as quick, it is a serious upgrade.

mDSD Technical Specifications

  • 32-bit/384kHz PCM and native DSD 256 decoding
  • Discrete USB audio receiver and D/A converter
  • Asynchronous transfer mode for doubled jitter-reduction at data input and over-sampling filter stages
  • High-performance headphone amplifier
  • Optical output (shared with 3.5mm headphone out) capable of S/PDIF and DoP stream
  • USB powered, no external power supply required
  • Diminutive size measuring just 2 – 3/8″ x 1 – 3/16″ x 3/8″
  • Works with Android (4.1 & above with OTG), iOS (with camera adapter USB cable), Windows 7/8/10, and Mac.
  • Available in silver or black finish

44 Responses

  1. Tannoy

    It’s obvous this model is meant to be a competitor to the Geek Out models from LH Labs. Have you heard the differences? I own the GO 720 from LH Labs.

  2. Yuriy

    I tested power consumption Encore mDSD with USB tester it shows ~180ma. Tested on Motorola Droid Turbo 2, Lenovo P770 and direct plug to USB charger.

  3. Kevin Le

    Have you had a chance to try out the new Dragonflys? Curious how they compare to this.

    • Sally Mae

      I have both DFs and they are wonderful. The Black shares the same DAC as this device but the Red gets the superior ESS Sabre 9016 with built in 64 bit digital volume control.
      Orchestral music off of an iPod Touch through the Red and out of my Shure 1840’s is stunning.

  4. Marcel Hijma

    What can you do with the optical out ? Why should you use the optical out because then you loose the DAC function of the mDSD isn’t it ?. I would like to connect the mDSD to my receiver, Should I use 5 meter USB or 5 meter good quality audio Jack/RCA cable ?

    • headfonics

      People use optical a lot actually and it’s a digital output that allows you to connect to a range of DAC’S that may not have USB input direct to source. Your question thogh on what cable to use is confusing as there is no usb out on the mDSD.

      • Marcel Hijma

        Ok thank you for your reply. Well I did mean USB 5 meters from PC to mDSD or 5 meters from mDSD to receiver. The distance between my PC and receiver is 5 meters.

      • headfonics

        oh i would go USB 5 meter from PC to mDSD for sure on this one :)

  5. Sumrit Jukpetvorrayan

    I read in your review that mDSD draw just 20mA from mobile device. But my mDSD is draw about 300-350mA plug or un-plug headphone.
    It work great with PC but cannot with my Android phone except connect it with powerbank + OTG cable, it work but show using 300-340mA from powerbank that why I think it should not work when pure direct connect to my phone.
    So I wonder the 20mA was come from your testing or from spec sheet (that I could not find). Don’t get me wrong, I just make sure that my mDSD is defect or not.
    Thank you.

    • headfonics

      Did you try the mDSD out of another Android smartphone? My testing on the iTouch proved successful using a lightning to USB connector and iOS.

      • Sumrit Jukpetvorrayan

        I just try to use mDSD with Nexus7, it’s work without using power bank but alway consume about 340-350mA with and without headphone.

        And for testing how many power that my cheap phone (Moto E 2015) can supply. I use Fiio Q1 (I know It’s a dac with batt), it’s draw power about 120mA when charge and 000mA un-charge.
        Now I know my phone can supply at least 120mA.

        I don’t think my phone can supply high power like 350mA without helping with power bank. Because it’s a cheap phone or It’s may be my mDSD a defect one???

        But how many power that mDSD draw from your phone and iTouch, it’s about 20mA, right?

      • headfonics

        The power draw is consistent with iOS maximum parameters for power drawing or else it wouldn’t work.

      • Sumrit Jukpetvorrayan

        So, ” mDSD draw just 20mA from mobile device ” in this review just came from Sonicunity’s paper, right? I ask to make sure that no one can see 20mA with mDSD in real life. But I’m very confused because even at Indiegogo or Sonicunity , I cannot find anything 20mA. This spec is so good to be proud to show to buyers.

      • Sumrit Jukpetvorrayan

        headfonics – I don’t think the story of limitation of iOS from 2 years old post will help or concern in this case. Thanks anyway.

      • headfonics

        You missed the point, the article link is to show to you that the CKK is gimped at 20mah Thus if the mDSD works with a software driven output at 20mah that means it complies and can function with that level of output. That does not mean the mDSD is in itself fixed at 20mah, it just means it can operate as low as that.

      • Sumrit Jukpetvorrayan

        I get your point, if mDSD can operate by using Apple USB Camera Adapter. It’s meant mDSD draw current <= 20 mA, Thank you.

      • headfonics

        It means it can operate under 20ma, it does not mean that in itself it draws a max of 20ma, it could draw more if allowed to which is where maybe your Android phone falls down. I have tested it on 3 Android phones, a mid-tier, budget and a flagship Sony – the mid tier and Sony worked no issues, the budget one was intermittent meaning power was not sufficient though all 3 recognised the device.

        Here is a useful tool if you ever get a chance to buy from Amazon:

      • Sumrit Jukpetvorrayan

        I don’t understand if mDSD can operate under 20mA, why my Android phone will allow mDSD draw more current to fail itself.

        And I already have a tool like in your link and used it. That’s why I know mDSD draw 340-350mA from my Nexus7.

        I would like to recommend a useful app for Android, its call “Ampere”. It can show the discharging current from your android phones.

        Sorry that not put the link here, don’t want to wait for approval.

  6. Leo Palazhevets

    Having permanent problems when using the mDSD with iPhone 5S or iPad Air 2 – despite developer’s promises, error “USB device drawing too much power” occurs too often (with Apple Lightning to USB Camera Adapter, MD821ZM/A). The error occurs always when trying to use high resolution players like Onkyo HD Player in DSD modes. So, the device could only be apparently used with the standard player.. with fear of getting an error message every minute. Not for mobile devices.

    • headfonics

      Thanks for the update – this only happened to me once and it was the first time I used it on iOS devices which naturally led to some temporary alarm before replugging it back in to make the gremlins run away.

  7. eaglesgift

    I was going to order one of these but when I emailed Sonic Unity to ask them what the output impedance was, the reply I received stated that they don’t provide output impedance data for any of their DACs and they do understand it’s a controversial topic (decision I think they mean).

    It’s up to them what they disclose of course but they’ve lost at least one sale because of their policy. I’m afraid that when a manufacturer refuses to disclose pertinent data, I assume it is because the data in question is not very flattering. That is to say, if the output impedance of this DAC was < 1 ohm, I think they might have a different policy.

    I could be mistaken of course but that's the risk companies run when they choose to be secretive for no good reason – that of giving potential customers the wrong impression.

      • eaglesgift

        Hi, that’s very kind of you but please don’t put yourself out on my account. I’ll probably just take my pick from the other attractively priced DACs you’ve reviewed.


      • headfonics

        its no bother, email took all of 10 seconds to write. If I get a reply I will post it here :)

      • juiceandberries

        Hello Do we have an update regarding the output impedance of mDSD? I’m in the market for a new DAC and this will be a valuable info. I’m also interested on how it pairs with 64 Audio A12. Thanks!

      • headfonics

        Sadly none, I enquired and yup its a bit of a secret so we wont get the inside scoop on that. What I will do is is some testing on the A12 for you shortly.

      • juiceandberries

        Thank you very much for the update! :) I’m still on the market for a very portable DAC. This Encore mdsd and the new Audioquest dragonfly black and red are currently on my radar.

      • jos_l

        Thanks, your input is appreciated. I have both and want to pair them with this and hopefully buy before the Indiegogo campaign ends.

    • headfonics

      Sorry I do not have the DacMagic XS to compare tonally but on paper the specs of the mDSD are far superior. You have a higher decoding capability and an spdif out which the XS does not have.

  8. Steffan

    Would have been nice to include a mention of how this performs against other usb amps/dacs like the Schiit Fulla. Oh well, opportunity lost.

  9. Michael Gunin

    Thanks for reviewing! How does it overall compare to D3 or microStreamer, for example? Are they more or less in the same league?

    • headfonics

      I think it bests the D3 with a higher resolution capability and the spdif dual 3.5mm jack making it system capable. microStreamer never tried.

    • headfonics

      Nope its the 9010k2m but I dropped the reference to the ha-2 which quite rightly uses the 9018, herus and the uDSD do indeed use the 9010k2m chip which is a 2 channel chip.


Leave a Reply

Your email address will not be published.

Final Score

This site uses Akismet to reduce spam. Learn how your comment data is processed.