Hi All- this was very surprising to me and when I was 'in it" I did not see too many posts regarding this topic, so thought I might add my results in case it helps. Quick pre summary:
Had always ran Roon Core on an i3 NUC/Win 10 using the excellent Fidelizer software to optimize the PC environment for audio. Audio out was USB to a Schitt Gungnir multibit DAC and got very good SQ out of this setup. Recently, has been some weird Bios-related NUC issues. In the process of fixing this, ended up with some weird deal where the NUC would flat out NOT send USB audio to my DAC. Well, I was frustrated with Windows, NUC and getting very tired of all the PC fiddling every spare minute I had over a couple weeks and still not getting USB audio! (anger!!)
Then I came across the Rock OS. And bought a Pi with Allo Digi One SPDIF out and thought to take a different direction. So, cloned my Win 10 SSD (glad for that later!!) and flashed Rock to the NUC for use as a server only with no local audio out. In both install and use, Rock was magnificent!! And I thought it should be with a purpose built OS exceeding bloated, problematic old windows, where you actually need a program like Fidelizer to make a damn PC be suitable for music playback.
Then came the listening in different zones while I waited for the Allo so I had music in my main system again.
First was the shop stereo, SQ was definitely different in a good we with nice open highs and a relaxed analog presentation.
But then I fired up my office, a 2.1 nearfield studio monitor setup with very “studio/accurate” imaging and soundstaging. To my surprise, changing the server OS quite affected the SQ. It was open, natural and analog sounding. but gone was my tight bass and the pinpoint imaging/huge soundstage I was used to enjoying through the Arcam RPlay streamer. Hmmmm???
Then the Allo Digi One got here and I was stoked to get a player in my main system again. It sounded good, but again I was surprised to the point of questioning the SQ as many of the imaging/soundstage and tight, fast integrated bass I was used to in this reference level 2.1 system were missing??
So, first noticing SQ differences in my office setup and then the main system too had me really questioning things running the trouble free nice Rock as server.
Next step was to get another OS SSD, restore my original Windows OS drive clone to it so now I had a situation where I could just swap HDs between Rock and Windows easily. Well, I only needed to swap it once and that was back to Win 10.
It very much surprised me, but running Roon software on the Win 10 NUC with Fidelizer immediately restored my SQ to the very high source level I am used to. Why?? I don’t know, but that’s how it was with my systems.
Another input, once I got that squared away the Allo DigiOne is a very nice sounding endpoint for Roon-spectacular!!