So your devices are UAC2 only? I'm coming from this " A UAC2 device can connect as a USB 2.0 device and can operate at either Full Speed or High Speed. However the UAC2 specification states that, “the changes introduced in UAC2 are not generally backwards compatible to UAC1.” Therefore a USB audio device must choose to declare itself as either a UAC1 device or a UAC2 device at enumeration. " from here: http://www.epsglobal.com/downloads/XMOS/Why-do-you-need-USB-Audio-Class-2.pdf Because up until now, I was assuming UAC2 is/are all together independant audio specific functions of USB drivers, but judging from the link above, UAC class goes hand in hand with USB interface type, 1 or 2. So now I'm in relief, as I have USB 3 on my box... Hence I guess UAC2 is given?

As far as music/stereo is concerned, I'm pretty sure it's going to be an ecstatic experience, no doubt in my mind, and I'll be glad to share my experience with you! I'm more worried with AC-3 (Dolby Digital), if there will be at sound at all... Especially since I'll be streaming it from Android box (if I understand correctly, Android v7 (Api level 24) supports only USB Audio Class 1 at the moment, and I assume I'll need UAC2 for the AC-3). Reports for other U2S converters are scarce on the internet, and no clear clue about what makes it work and what doesn't. I guess there is only one way to find out anyway. :)

Agreed. :) Okay, I understand. Just for completeness sake, where would you put HDMI sound? Or put differently, if one would have AVR with all of the inputs from above, which one is generally best? Good point, placing my order today. *grin*

Hey John, No it's not so hard to beleive, some people (like me) are very loyal to the equipment they share a past with. Yet, I miss the sound from CD player (which died few years back). :) " Even without USB isolation (the ISO devices), my experience is that well implemented USB sounds better than a well implemented SPDIF connection. " I was just about to order the ISO-SPDIF, and now this got me worried. :) I own an oldie but goldie Yamaha (http://www.hifi-review.com/153478-yamaha-dsp-a3090.html) surround amplifier, and in terms of digital inputs, all I have is Toslink and S/PDIF. My goal is to listen to music in "front speakers only", so stereo mode, and enjoy the movie surround sound via Doly Digital (AC-3). Source of my media files is an Android box running Android v7, with USB DAC support. I'm currently feeding the music directly to analogue RCA inputs via a Wolfson DAC (Bluetooth), and this sounds pretty nice, especially compared to the sound that I get if I feed FLAC via Toslink to the very same amplifier. So, to some degree, I'm aware of what the Yamaha is capable of delivering, yet, I get no satisfaction from Toslink inputted music. I was hoping to go to the next level with your ISO-SPDIF invention, feeding FLAC (and AC-3) from Android to Yamaha. Am I on the right track? Feel free to express yourself, no need for being political. *grin* Thanks!