Cd's played back through a PS3 should give you very loud levels, nearly equal to BR if not louder as is my case with my BR player. I have to turn down my Denon 3808 to achieve similar dbs to movies when playing cd's or streaming music.

Is there some sort of setting in the Onkyo that is cutting dynamic range/night mode or something similar when only music is selected?

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70