About the setting I mentioned before for the volume control. When an audio track is playing, hit the green triangle button to bring up the options pop-up. Go to the speaker icon in the upper left, and make sure it is set to Normal, not + or - anything. That setting alone can really mess up how the audio sounds.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs