Hello,
I’m a Roon enthusiast, but there’s clearly something wrong in the way some of its hidden settings may impact volume, hence perception of sound quality.
I noticed by the past that the volume of the exact same track was louder if played from Mosaic than from Roon.
I finally turned those two options “on” in Roon to get the same volume as Mosaic.
Hope this can help,
Erwan