Cayin RU6

Review Date: 12 January 2022


  • 24-Bit Discrete R-2R Resistor Ladder DAC
  • 1/1000 ultra-high precision TCR25 low temperature coefficient thin film resistors
  • Support up to PCM 384kHz and DSD 64/128/256
  • Low power consumption
  • User selectable NOS/OS DA Mode
  • NOS mode: digital filter-less, low phase distortion, low jitter, no ringing artifact
  • OS mode: increased sampling rate, enhance resolution, reduce noise, improve anti-aliasing
  • 99 steps Multi-segments High Precision Resistor Array Volume Control
  • Hardware Volume +/- button
  • TWO 6-layers PCB, digital and analog circuit on separate boards
  • 3.5mm single-ended phone output delivers 138mW per channel at 32Ω loading
  • 4.4mm balanced phone output delivers 213mW per channel at 32Ω loading
  • Compatible with Android, iOS, iPad OS, macOS, Windows 7/8/8,1/10 and DAP with USB Audio output
  • Type-C USB Audio, Shield USB-C to USB-C cable bundled.
  • High/Low gain control
  • Compact and seamless CNC aluminum chassis with 1” OLED screen at 28g.
  • Optional Leather cases: orange or blue
  • Optional USB-C to lightning cable


  • FOSTEX T40RP MK3 (Magnetic Planar, 50 Ohm, 91db Sensitivity)
  • Beyerdynamic DT880 (Dynamic Drivers, 600 Ohm, 96db Sensitivity)


  • Etymotic ER4SR (Single BA, 45 Ohm, 96db Sensitivity)
  • TRN VX Pro (8 BA + 1DD Hybrid, 22 Ohm, 106db Sensitivity)
  • TIN HiFi T3+ (Single DD, 32 Ohm, 105db Sensitivity)
  • Shure KSE1500 (Single Electrostatic 200V, KSA1200 Energizer)


  • VE Asura 3.0 FE (Single DD, 155 Ohm)
  • VE ZEN 2.0 SLQ (Single DD, 320 Ohm)


  • Windows 10, Foobar 2000 (Native USB Drivers)
  • LG V50 ThinQ (UAPP USB Exclusive Mode, Bitperfect)
  • Sony Xperia X Compact (UAPP USB Exclusive Mode, Bitperfect)

Comparative Reference DAC/Amp:

  • iFi ZEN DAC V2 + ZEN CAN Stack (15.1 Vrms)


Cayin RU6 is a very special Dongle. It is Cayin’s first ever DAC/Amp in Dongle form factor and most importantly, it is the very first non Delta Sigma Dongle ever. Instead of building RU6 on the common DAC chips widely available out in the market now, Cayin opted for the much more complex R-2R design which was adopted from their highly regarded R01 Module for Cayin N6ii. Suffice to say that this has gotten me so pumped up that after completing #donglemadness 2021 with 100 Dongles, I have opted to conclude the adventure and “retire”. Alas my morbid curiosity to try out this new innovation outweighs my reservation. And thus #donglemadness came back to life in 2022 simply because with the purchase of my RU6, the floodgates reopened for me to buy every prominent Dongles available out there that I have yet to test 😀

Build, Functions, Usability

RU6 is one hell of elegant device. For the asking price I expect no less from Cayin. Just like my previous DAPs of N6ii E02 and N3 Pro, black theme with glass faceplate implemented here to cement the signature look of Cayin. The unit offers standard accessories needed to run on the fly with any USB-C devices or PC with USB-A (via included adapter). iOS users may need to buy Lightning to C cable separately.

One most prominent feature that I find very interesting with RU6, it offers two switchable modes named OS (Oversampling) and NOS (NON Oversampling). What this does, OS mode toggles the RU6 to resampling of feeds to 384kHz through digital filters. NOS on the other hand, will not do any resampling and will allow the feed to be processed as it is. For my own extensive use, since I am almost exclusively on UAPP bitperfect or HiBy Music Player USB Exclusive Mode, the NOS option proved to be the better choice. It offers 100% source transparency and allowed me to enjoy my music unaltered. The usage of OS on the other hand, may proved useful if UAPP or HiBy Music Player are not used. For example playing Spotify or YouTube Music which does not have USB Exclusive mode, the OS mode will then override stock Android SRC and that to me is a much better option over native Android resampling.

Another great feature of RU6, the volume adjustment. High Precision Resistor Array Volume Control is implemented and I can attest this being one of the most refined volume steps adjustment that I have ever tested so far with Dongles. I must say that the refinement is on par with what I get from my all time favorite the CEntrance DACport HD. To be fair, Luxury & Precision W2, Lotoo PAW S1 and S2 offers similar type of volume adjusters (since all of them has LED screen), but I find RU6 and DACport HD being even more refined. I must note though, that sometimes RU6 will exhibit very brief stutter when changing volume level especially when used with UAPP and HiBy Music Player, so I would not place this as a Cons against RU6, because it did not behave that way on Windows or other non exclusive Android music players.

The other functions worth mentioning is the Hi and Lo Gain selection. This proved to be very useful as I am using my RU6 with anything from as high as 110db to as low as 91db of sensitivity listening devices with resistances up to 600 Ohm. The most powerful output being the 4.4mm BAL port at High Gain.

Other than that, RU6 thankfully is so very spartan as it does not have any EQ functions. And I am perfectly fine with this as I have never used any EQ for any of my gears since forever. For those wanting to alter or color the sound with EQ, then the W2 would be a better choice.

As for battery consumption, I have measured my RU6 on Sony Xperia X Compact (Android 8, 2700 mAH, UAPP bitperfect mode, Low Gain driving TRN VX Pro) and the results yielded 6 hours of continuous play by the time the battery reached 3% (from 100%). Admittedly nothing too impressive here. But assuredly much better than DACport HD which only manage a measly 3.5 hours. On par with Lotoo PAW S2 driving the same load.

Sound Impressions

This is the most important part. To me, the biggest appeal of RU6, it was designed with a legacy Rail to Rail Array Resistors audio processing which clearly revealed the intent by Cayin on why they choose it – True Analogue sound. Why bother with Analogue sound anyway? you see, there was a time audio were all non digital and during those days there’s certain appreciation for sound quality that is as real as possible. With Delta Sigma audio processors, what I am hearing today is sound presentation that is very clean, detailed, resolving and analytical – and I can understand that many love it that way. However, they often ended up being too clean sounding that they lacked musicality and some even lacking realism altogether. Real life isn’t that clean. Try spending time listening to actual live music or even studio sessions, they are anything but sterile clean. And this is the essence of Cayin RU6 – it is one of the most analogue sounding Dongle I have ever tested so far. Perhaps from critical standpoint, I find Ovidius B1, Apogee Groove and CEntrance DACport HD closer to being organic sounding, but RU6 is definitely there among these three Dongles that I loved so much.

Timbral signature and tonality of RU6 is definitely natural – devoid of any coloration. It is neither warm nor bright – it sounds correct. Analogue presentation with a hint of organic crispness and smoothness. It is wholesome as it is rich in density, no hint of being digital or lean sounding. This is evident when tested with Etymotic ER4SR and Shure KSE1500, my most trusted reference listening devices that will reveal the nature of the source truthfully. ER4SR being Diffused Field Neutral, exhibited the flatness of RU6 sound, which indicated that there’s no manipulation of sound frequencies beyond what is normal, no attempt by RU6 to spice things up unnaturally. KSE1500 on the other hand, reveals the natural organic side of RU6. That airy and life like presentation that literally place the listener INTO the music.

Despite being Analogue, RU6 exhibited exceeding competency with technicalities. Tested with my listening gears, what I am hearing is super transparent resolution throughout the dynamic range. Being Analogue sounding does not mean it has to be fuzzy. Details articulation is crisp and convincing, so is the resolution of imaging. The more resolving the pairing partner the better it is. In fact when paired with my ER4SR and Shure KSE1500 I am hearing every micro details that are available in the recordings.

On the other hand, the staging is amazingly spacious as it is wide. It is undoubtedly up there among the very best. For example with my TRN VX Pro which is already natively wide sounding, I am hearing effortless headroom of soundstage that can make me forget I am listening to an IEM. The same can be said for the rest of my gears and even the normally “narrow-ish” Fostex T40RP MK3 sounded sensibly spacious.

However if I am going to be nitpicking, I would say that I would have preferred RU6 to exhibit just a tiny bit more of smoothness. Don’t get me wrong, it is already admirably smooth, but comparing it against Lotoo PAW S2, Ovidius B1, Apogee Groove and CEntrance DACport HD, I can hear that RU6 favors crispness slightly more over smoothness. The good thing is, this crispiness approach is still very polished and mature if I am to compare it against the likes of Hidizs S9 Pro, E1DA 9038SG3, TempoTec Sonata E44 etc. – of which these dongles focuses primarily on “modern sound” reproduction. This is not a matter of right or wrong, it’s a matter of preferences and I can understand some listener prefer it that way. Audio is still a very subjective passion after all.

As for the presentation of the three major sound frequencies, Mids, Treble and Bass. I would say that being neutral, RU6 does not color the sound spectrum. A great source should always strive to be transparent and natural. What this means, when I use a specific listening device I expect it to sound as it is. With sound extensions, resolution, textures and details presented in the most truthful way. That being said, I am assuredly happy with the quality of RU6 dynamic range handling. Treble sounded realistic as it is naturally vibrant, Mids as rich as the listening device capable of emitting, Bass having visceral density which is real and engaging. Details and textures present as how they should be.

Driving Power, Gain Control and BAL-SE Differences

So how does RU6 performs on driving power delivery? To find out I have conducted exhaustive tests with two of my most difficult to drive Headphones. And RU6 does not disappoint. This is where I use my desktop stack of iFi ZEN DAC V2 + ZEN Can (15.1 Vrms) to ascertain how close RU6 able to drive those two monsters. With the ZEN stacks providing 100% experience, this is how RU6 compares: (done on 4.4mm BAL, NOS, High Gain)

  • Fostex T40RP MK3: 90% (Vol 75/100)
  • Beyerdynamic DT880: 80% (Vol 85/100)

The percentage being indication of how close RU6 to that iFi ZEN Stack. Of which the criteria for comparison as follows:

  • Listening loudness (proper level)
  • Dynamic transients and density
  • Headroom spacing and staging
  • Imaging strength
  • Details articulation

The percentage scored by RU6 is truly mind blowing. Comparing this against Luxury & Precision W2, that W2 only managed to score 70% (with Fostex T40RP MK3) at the very best. Clearly RU6 is a much better device for hard to drive partners.

On the other side of the spectrum, RU6 is as amazingly competent driving super sensitive stuffs like multi drivers hybrid IEMs. My TRN VX Pro, having 9 drivers per side and with super sensitivity, does not exhibit any unsavory floor noises nor does it sounded edgy or shouty.

BAL and SE Comparisons:

Etymotic ER4SR (Low Gain)
– SE 3.5mm – Vol 58/100
– BAL 4.4mm – Vol 50/100

TRN VX Pro (Low Gain)
– SE – Vol 35/100
– BAL – Vol 30/100

Marginally crisper dynamics density on BAL, perhaps by 5% of which the SE is no less impressive, in place of pronounced crispiness, less bite with more smoothing. Otherwise from quality perspective I found both to be quite satisfying, there are times I want to have solid crispness and solid imaging and the 4.4mm BAL will do the trick, there are times I enjoy articulated smoothness, switch to 3.5mm, Easy-peasy. In comparison, Luxury & Precision W2 is a disaster with the 3.5mm SE, where everything sounded subdued and outright uninspiring. W2 defacto SQ only to be had from the 4.4mm BAL – and even so, W2 trying too hard on being neutral and clean sounding making it less than realistic (Hi-Fi indeed but lacking soul), of which RU6 has that analogue timbral hint which keeps thing believable.

What I can conclude from this test, RU6 SE will be excellent for sensitive IEMs and the 4.4mm perfect for something a bit more stubborn like my ER4SR.


There’s not much I can add to what has already been said. I love this Cayin RU6. Everything that it is, RU6 epitomize near perfect Analogue sound in a very compact form factor. But yes, that’s the appeal of RU6, for those seeking the balance between musicality and technical competencies. Not an easy balance to attain. But RU6 did it. However I reckon that being Analogue it would probably mean RU6 will likely score terribly with measurements. So for those prioritizing measurements, RU6 may not be suitable unit.

In the end, finding myself using RU6 regularly alongside my all time favorite DACport HD proved to me that RU6 clicks to my heart. I spent no less than 6 hours daily listening to music. RU6 has found its way to the top segment of #donglemadness.


  • Analogue neutral crisp timbre
  • Mature & polished dynamics
  • Reference level technicalities
  • Clean background with zero floor noises
  • Amazing driving power
  • Reasonable battery draw on the host


  • Expensive
  • Occasionally the volume adjustment may exhibit stutter
  • Could use just a little bit more of smoothness

⭐⭐⭐⭐⭐ ($250)

Best Pairing: Anything up to 600 Ohm

Back to #donglemadness


  1. Kevin Davies says:

    Excellent review Andy. I was very curious about the RU6 as I have The RO1 module and love it.
    I’m old, and grew up on analog sources, so have a soft spot for that sound. I clung to vinyl as long as I could, eventually caved and went to CD, bypassed MP3 all together, and only went full digital when HiRes came along.
    I don’t use dongles, so held off on trying the RU6 out of sheer curiosity.
    So the only problem with your review…. I’m salivating again. 😊

    Liked by 1 person

    1. Andy.EF says:

      Lol, I can totally understand your predicament. I was from the cassette generations so yes, analogue sound presentation is what I cherish the most. But you already have the R01, and that’s already an amazing piece to have, so you are not missing anything really


  2. aiblut says:

    thanks for review. i agree about se vs. balanced. with my two iems i prefere se for solaris 2020 and balanced for vega 2020. the balanced is better but i think like you the difference is small

    Liked by 1 person

  3. Ruff says:

    I am so glad that you are back, that too with a great contestant – the ru6.

    Will you be posting a full review of Megatron and RAP5?
    How do you compare these powerful dongles including the dacport hd to the ve megtron if used with earbuds.

    Thanks a lot man. Your reviews are very useful and valuable me.


    1. Andy.EF says:

      Thank you. While I dearly love VE Megatron and RAP5, they are absolutely not classified as anything relevant to #donglemadness. They are more at home being desktop/laptop solutions. Honestly, among all the gears that I have, I love the DACport HD quite a lot more than anything else. Even if I have a 15.1 Vrms ZEN DAC V2 and ZEN Can, I will still use my DACport HD mostly. It’s a personal thing. Cheers


      1. Ruff says:

        Thanks man…
        Looking foreward to your content. I just enjoy it, even if i am not going to buying the product.

        Just seen the Shanling UA5 announcement. Just wanted to bring it to your attention. The volume is soo cool like the DACport.


      2. Andy.EF says:

        Thanks. I am getting that one too 🙂


  4. kadinh says:

    What makes the RU6 sit below the DACport HD?


    1. Andy.EF says:

      DACport HD simply better at it. A true desktop amp level fidelity. DACport HD offers legitimate Class A amplification of 775 mW at 4.1 Vrms. Driving my Beyerdynamic DT880 600 Ohm at 90% efficiency as compared to iFi ZEN Stack which offers 100%. RU6 came close enough at 80%. On top of that DACport HD has slight upper hand with overall smoothness while being crisp and exceedingly resolving. DACport HD remained the champion of #donglemadness for sheer sonic performances be it hard to drive or super sensitive IEMs


      1. kadin says:

        so if im looking for something to power IEMs only, is the RU6 the better choice?


      2. Andy.EF says:

        No, DACport HD is still better than RU6 overall even for sensitive IEMs. DACport HD power delivery (current) at 32 Ohm is unmatched by any Dongles in existence. What makes DACport HD superior is that it has that authority even at lower voltage delivering the highest Wattage of current than any other competitor and this is already evident even at as low as 16 Ohms. On top of that despite all that power DACport HD remains clean and articulate with these sensitive IEMs. To me that’s a prime example of a true winner


  5. Louis says:

    Great review as usual! I recently picked up the RU6, and it is my favorite dac hands down! I have the magni/modi stack, DC05, Fiio KA3, and an assortment of apple adapters. The RU6 may not measure well but there is just something special about it- paired with my Moondrop variations it is total audio bliss for me.


    1. Andy.EF says:

      I know the feeling. Music enjoyment if what we after, not measurements, lol


  6. Jun says:

    Hi Andy, great review! What are your thoughts on feeding the RU6 to an external amplifier?


    1. Andy.EF says:

      Thanks. RU6 serving as AUX feed for external amps works great too. As noted in my review it pairs amazingly well with Shure KSE1500 which runs on KSA1200 Electrostatic Energizer amp. Similarly it runs superb with VE RAP5. Just set the gain to High, source audio to 100% and RU6 volume to approx 70/100, you got a clean Line Out there 😀


  7. Dez says:

    Hi Andy, how does this compare to the Sonata E44? In terms of musicality, soundstage, detail retrieval and tonaliy.


    1. Andy.EF says:

      RU6 is more musical obviously. As I mentioned several times in my review, it sounds analogue and that means it is closer to realistic sound reproduction while being musical. E44 is clean, but it also sounds “modern” and a bit more digital when compared to E44. On the subject of details, tonality and soundstage I have clearly describe those in my reviews, and for the fact that RU6 is ranked above E44 should give you good idea of my thoughts on it. Cheers


  8. ET says:

    Does RU6 need any 3rd party driver or just the built in windows USB audio driver? ‘Native USB Drivers’ is a bit confusing- native to the device or to windows?


    1. Andy.EF says:

      The entirety of my usage on all of the dongles are on native Windows 10 USB drivers, works perfectly fine for me. This includes RU6


      1. ET says:

        So just to clarify, no drivers necessary for RU6 on PC, just plug and play in your experience? Thanks for the help.


      2. Andy.EF says:

        Yes, plug and play


  9. Lepine says:

    Hello Andy, I find your website a tremendous resource. I am happy to have come across this from Head-Fi. I have a bunch of perhaps overkill hardware. McIntosh MHA200, Chord HugoTT2 & M-Scalar, Astell&Kern SP2000, etc. Plenty of crazy software too like HQPlayer running off of a dedicated NVidia card. After reading here first about the Hidizs S9 Pro, I got one and I am really amazed at how well it performs on 2.5mm balanced. I can hear a loss of detail and drive on 3.5mm, so I don’t really use it that way. I have a CEntrance DACPort HD on the way, again you pointed this out as the best of the best. Now I am really curious about the Cayin RU6. I have never had the opportunity to hear a R2R DAC and do not know what to expect. I’ve seen another review that compared it to the new Chord Mojo2 and the comment that in absolute terms, it is no contest, the Mojo2 will kill the Cayin. However, I am really still curious, but I am not sure if I want to try out the Cayin and find out it doesn’t have the transient capabilities of the S9 Pro or the dynamics of it. Is the Cayin significantly “softer” sounding than the S9 Pro and the Mojo (I have a Mojo and Hugo2)? The DACPort has not arrived yet, do you think I should just pass on the RU6 as it might not match my preferences? I don’t listen to much pop or hard rock. I prefer Jazz and singer/song writer style music from many countries and languages. I am really interested in the sounds of the voice as well as stringed instruments. The textures of the sound and life like dynamics is important for me to achieve that realism like I am really there in person. S9 Pro is wonderful, so absolutely crystal clear, but maybe there is more that I am missing?


    1. Andy.EF says:

      Thanks. I am glad you find my adventures helpful. For someone to claim that Chord Mojo 2 killing RU6 is an overstatement. The reality of audio gears, diminishing returns as the chain gets higher. From my own experience, the perceived value of one item’s quality over another superior one mostly marginal especially if both item are already performing at levels above the rest of the competitors. For example between Hidizs S9 Pro and Apogee Groove, 5 years separate them yet when I compare them both side by side, Apogee Groove has the upper hand, but to say Apogee Groove kills S9 Pro would be an extreme expression at most. We always do that to instill a sense of satisfaction. Now, RU6 X factor as how I mentioned several times in my review, being truthfully closer to analogue sound which I treasure more than anything else. However the same cannot be said for everyone as we all have our own preferences, so if you like the classic analogue sound signature, then RU6, DACport HD, Ovidius B1 and Lotoo PAW S2 fits the bill. DACport HD, B1 and RU6 being the most prominent. However worth to note that these devices that I adore so much may likely score terribly on measurements because analogue sound is not about sounding super clean to a point of being sterile. So, if you prefer the more modern, pristine “Hi-Fi” sort of sound then look elsewhere, Colorfly CDA M1, L&P W2, Hidizs S9 Pro may be a better fit. But to me personally, yes they sound super clean, but I feel they lacked soul of music and sense of organic realism – they still sounded digital to my ears. But then it depends on what you consider pleasurable. We cannot expect for us humans to be similar in the matter of taste. Cheers


      1. Lepine says:

        Thank you for your quick reply. I agree with much of what you have said. I may just buy the RU6 and get it over with, it’s less than the cost of an iem cable. I assume that you still spend much time with the RU6 even though you have the DACPort HD, which would suggest that there is still a difference between them and the DACPort isn’t that much more superior that listing to the RU6 is less enjoyable. Is that a fair statement? Best Regards S.


      2. Andy.EF says:

        Yes. That’s a fair statement. The reality is DACport HD is such a clunky monster that I love so much but RU6 is more merciful for portable usage. Ultimately I must admit DACport HD still hold a very special place in my preference over 112 Dongles that I have. Any of my personal top 5 are regularly used nonetheless


  10. Lepine says:

    Great, based on your recommendations, I will be enjoying three dongles 🙂 With audio gear, there is unfortunately, always room for more! Love the S9 Pro, DACPort HD inbound, RU6 about to be ordered.

    Liked by 1 person

  11. Lepine says:

    I took delivery of the Cayin RU6 yesterday. This is my first encounter with an R2R DAC. I am pretty much a solid Chord and Astell & Kerns patron having acquired and keeping most of their line ups for more than 5 years. Listening to the RU6 has been enlightening. I wasn’t expecting another kind of sound signature that I would enjoy as much as the M-Scalar or SP2000 Copper.

    Now for the problem…I was going to buy the wife a refrigerator. The RU6 has me looking a Denafrips Ares II and Schiit Bifrost 2 reviews. I’ve even begun looking at the Hiby RS6. I think there is going to be a battle on the home front.

    The Cayin RU6 with a Sony IER 1ZR earphone is quite interesting. I think this is going to be my rig for the next couple of weeks non-stop.

    Thanks again for sharing your thoughts on these dongles.
    But then again, home life is going to be rough for the next few days so maybe no 🙂


    Liked by 1 person

    1. Andy.EF says:

      Great to hear you like it. RU6 is indeed very special. And good luck!!!


  12. Lepine says:

    Yes, I really am enjoying the RU6. I hooked it up to a HeadAmp GS-X mini (high gain setting) and started to A/B test it against my HugoTT2/ M-Scalar. I was worried that the RU6 was too good.

    The HugoTT2/M-Scalar murdered (better resolution, better tonality, more natural impact) the RU6/GS-X mini, but I was not certain going into the comparison if the Chords were going to be clearly better than the Cayin. With the addition of the right amp (smooth analytical sounding), the Cayin could pull off a big surprise.

    For it’s intended portable use, wow, this is a genuine beauty, but I am putting it into my racks.

    Liked by 1 person

  13. Luvaga says:

    Helli Andy, i am using samsung music for daily,omly using offline files like dsd, wqv and flac. I have purchased ru6 and i am wondering if i can use this without uapp?
    I read this on my phone specs:

    It supports high-resolution music (32-bit/384kHz sampling rates)

    So i wonder will it work on ru6
    Thank you


    1. Andy.EF says:

      Yes of course if will still work without UAPP


      1. Luvaga says:

        Will it be a lot of difference compared to uapp. I don’t stream, only offline flac and dsd


  14. Vincent says:

    first of all i would like to thank andy for his work, which helped me in my choice. so I bought the cayin RU6 which works with a Grado SR 325x headset, plugged into my old macbook pro. I use audirvana to play audio files.
    le son est devenu incroyable et je redécouvre mes morceaux !
    the sound has become incredible and I am rediscovering my songs!
    WARNING: the RU6 does not work with an iPhone, the outgoing current being too weak to supply the Dac…


    1. Andy.EF says:

      Thanks Vincent. And for the feedbacks too. Enjoy your RU6!


  15. Lepine says:

    Hello Andy,

    I too think you are helping the community choose the best dongles out there. I bought three dongles based on your evaluations. Two of them, I use now all the time. More often that firing up the big gear or hooking up a dap. When dongles sound this good and all the music is on my laptop, it’s just so much easier to listen to music with very very little compromise.

    The RU6 and DACportHD are definitely my favorites of the three I bought. If there is another dongle similar to the RU6 where somehow average recordings can get cleaned up by the dongle to become more musical. Please let me know. I assume R2R has something to do with the loss of harshness of the original recording without a “brickwall” approach to filtering that just blurs out details and subtle dynamics. It seems all the intended original feel of the music is retained by the RU6 without imparting a “signature” to the frequency response is great. Again if you know of another dongle that does this, please let me know.

    Liked by 1 person

    1. Andy.EF says:

      Ovidius B1 is another one


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