I have little huge amount of experience with Innuos products, but Pr155a1's experience triggered a memory in my old brain. A couple of years ago I had a loan of a Innuos ZENith MKIII 1TB (from Elite Audio in Scotland). I had hoped that I'd be able to keep it to replace my Windows music laptop, but it didn't work out that way.
My DAC was the AGD R7 but I didn't have the DI20 (or any other DDC) at the time.
I've tracked back through my emails with Andrew at Elite, and found the following (5July21):
'For some reason music sounds distorted some of the time. It's a bit like listening to music through a cheap radio, a kind of crackling. This applies both to my library on the Zenith hard drive, or streamed music from Qobuz. At the moment this also seems a bit random, and I'm still trying to trace the issue. I never had this problem with my music laptop. I'm going to change cables over this afternoon, and see if that helps'.
Later that day:
'Hi Andrew,
Have spent the last 1.5 hours with the Innuos, and it's been a bit frustrating to put it mildly. This is what I have tried:
Used a different USB cable to connect it to the DAC
Used a different power cable to the Innuos
Used the Innuos power cable but connected it directly to the wall outlet, not to my mains distribution block
The Innuos was on top of my DAC but raised up above it by a good 6-7 cms. But I moved it to its own shelf
Used a different ethernet cable to connect the Innuos to my Netgear switch
Re-checked all the settings in My Innuos
Result: the distortion sometimes is there, and sometimes not. Sometimes the music is distorted from the outset, sometimes the music starts normally but the distortion progressively kicks in after around 30 seconds. It all remains totally random.
At the moment music sounds OK. Don't ask me why.
I need to do other things now, but it seems to be that this isn't as it should be.............
Best wishes
Mark'
And again later that day:
'I have just sat down with the Innuos again. I had left it powered on, in case that helped, and the last time I listened to it the music sounded OK. I opened up iPeng and started a track: all was good. But then I just wanted to check that the volume in iPeng was set at 100%. All I did was move the iPeng volume slider a touch ........ and the distortion immediately kicked in again. Even when I returned the slider to 100% the distortion remained. The only way I could rid of it was to stop the track, turn iPeng off (there's a 'power' button in the bottom left hand corner), and then turn iPeng back on again. I restarted the track: no distortion. I moved the volume slider again: this time no distortion.
This is all a bit random, and I don't think this is what should be happening. I'm not totally convinced that this Zenith is working as it should. The idea was to move from my music laptop to something with a slicker interface. I have never had these problems with my music laptop: it has always worked 100% of the time, and TBH sounds to my ears a little better than the Innuos. In terms of the iPeng interface, it's OK ..... however I don't find that it's as intuitive as either the Qobuz desktop app or Audirvana. This may just be a question of familiarity, of course.
Incidentally, whether iPeng can 'see' the Zenith remains a bit hit and miss, irrespective of the amount of time that the Innuos has been switched on. Sometimes the Zenith appears in iPeng in the bottom lefthand corner, only to then disappear, then reappear, then disappear again. Finally it may recognise the Zenith and firmly lock onto it, but other times I just have to restart the Zenith'.
6Jul21:
'Hi Andrew
Just an addendum to last night’s email. I turned the Zenith off last night, and turned it back on again this morning a good ten minutes before I started listening to music. I started playing a track, and the distortion was there immediately.
I slid the volume control up and down in iPeng, but this made no difference. I turned my DAC off and on again but again the distortion remained.
I have now taken the Zenith out of my system. I have put my music laptop back in, started playing the same track .... and it’s playing perfectly.
Best wishes,
Mark'
In the end Elite took the Zenith back, and I kept my Windows music laptop.