Could the sound quality of music improve without volume control?

Thanks a lot to the team of Libreelec for this great tool!

I am happy with the quality of the music from flac files playing through my avr by hdmi/optical.

But the sound is even better when the music is playing using libreelec as upnp server. Maybe kodi needs to process pcm info before sending to hdmi/optical to allow volume control -maybe some other features- that could be degrade slightly the sound quality.

How to volume control could be bypassed to get original pcm signal by hdmi/optical?

(S912 - Minix U9 - Libreelec 8.2.4.1)

I have updated to LE 8.2.5 and change some of those settings:

- Number of Channels > 2 (unchanged)

- Output configuration > Best Match (unchanged)

- Maintain Original Volume on Downmix > OFF (changed from ON)

- Booost center channel when downmixing > 0DB (changed from 10dB)

and ... it works!! - Now, I cannot discern between playing by upnp and hdmi/optical.

Many thanks for your help!

I'm afraid marantz av8801 shows sample freq and number of channels but not bit depth.