Just noticed this showed up… 
Pretty cool stuff… 
https://en.cayin.cn/products_info?itemid=140
Head-Fi announcement thread:
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Hello,
Yes, I saw it at the beginning of November.
The first deliveries have already been made.
I am curious about the impressions.
The concept looks interesting and courageous, especially in this day and age.
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Yeah, I’ve seen it too, but not much mention of it here.
Actually only mentioned in this thread:
If it’s properly implemented it might end up being my first R2R (and a Soekris 2541 or Bifrost 2 coming in later on)…
Mine will be delivered today.
I’m looking forward to comparing it to the W2, which IMHO is the most impressive dongle made to date.
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Looking forward to hearing Your impressions of it! 
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only one estore that has it?
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So, I was just glossing over the product page, and looking at the specs… Is it me, or is this thing really lacking in power? Or could this possibly be a case of under specking a product, you know the “under promise, over provide”?
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So mine arrived yesterday and I mounted it on the back of a dedicated iPhone source that I use with iems (blu tack 
).
First impressions after a couple of hours using it with Aune Jaspers, Dunu SA6, and UM MEST MKIIs…
Full range and impressive sound. Not a black background, clicks pops and static before the music starts and in between tracks. Not really noticeable while the music is playing. Volume can only be controlled on the RU6 itself not your source device. Slight pause/click when I turn the phone’s screen on and off.
Power? Plenty. Just tried my Sendy Aiva planars and it handled those with no problem. It will get loud enough to damage your hearing no matter what headphones you have.
Now compared to the L&P W2? The W2 is just better (subjective, non-golden ears listener). Slightly better fullness to the sound without any of the negatives. More filter and tuning options to select from and just more features in general for just a little more $.
If you’re stepping up to a “premium” dongle from a lesser one you’ll be pleased and impressed with the sound. BUT, the W2 also exists. IMHO, the W2 is still the top dog. Sure the R-2R tech in the RU6 is really cool, but the implementation of the dual CS43198 chips in the W2 is just a little bit better in my view.
My advice/initial impression? Spend a little more and get the W2.
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Thanks for the info
Out of the dongles I’ve tried the W2 has been the clear winner as well, the RU6 interested me, but if it’s not really doing anything different to justify itself vs a W2 not sure if I want to pick one up or not now
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Yeah, the clicks and pops bother me. I haven’t experienced that before with my gear. I’m not any good at describing sound, but I do try to do more critical listening than the average Joe.
For me, the W2 is the clear choice and I would pass on the RU6. A little disappointing as I had high expectations after jumping on the R-2R bandwagon with the HiBy RS6 DAP. I highly recommend that one! 
Hmmm that can happen with some music players or sources and not others, so perhaps try it on a few different devices and see if it still happens. It’s somewhat normal for some dacs to click and pop when they change bit depth or sample rate, but it shouldn’t happen every single track change if it’s the same format. Regardless it shouldn’t be happening in between tracks, that sounds like a player or transport problem
The rs6 looks quite interesting, although I haven’t jumped on it since I’m set with my P6 pro lol
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Just a note. Cayin says to give it about 100 hours of burn-in, so there’s a chance it’ll get better… 🤷🙂
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That’s true, my LP r2r daps had gotten better with more time on them, it would make sense I’d happen here (there’s also a warm up time). Also I’d imagine the device it’s connected to and the power it supplies would also make a reasonable difference in this case as well
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They also mention that in the Head-Fi thread I linked…
The limit on (most) phones is 100mA I believe and 500mA on USB 2.0 and 900mA on USB 3.0.
That’s not a lot of juice and I would imagine it would lack punch perhaps?
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I’m sure there’s more to it than that as well, could be loss of stage, loss of dynamics, lack of body, aforementioned punch, etc. Noticed some of those happening on other dongles I’ve tried when the device wasn’t giving it good power
Also the lack of body aspect is something I experienced when I initially got my p6 and p6 pro, which later went away after leaving it on for some days, and also making sure it warms up for 30min-hr before use
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Good call, I will do that 
.
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Well I will be returning the RU6 as I just can’t listen to it with its “issues.” Andrew at Musicteck will test it upon receipt to see if I just may have received a defective unit.
I hope that’s the case, as I think Cayin generally makes excellent stuff. I’ll be interested in what he says after trying it himself.
For what it’s worth he indicated that no one else has reported the problem I had. Will post his findings when I find out.
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I agree with this comment:
RU6 = more realistic sound, horn speaker dynamics, less detail & refinement, far more excitement & startling factor. Faster with more air & less processed, potentially fatiguing.
W2 = less realistic, conventional speaker dynamics, more detail & refinement, far more delicacy & smooth polish. Slower with less air & more processed, easy to listen to.
Especially the very last comparison highlighted the above-mentioned findings. Ru6 is much more my style.
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