For 2 months I have owned a Denon 3802. I have always left the Tone control (bass + treble) at 0. I just picked up a few DVDA discs and noticed they sounded a bit shallow. I raised the bass to +4 and the treble to +6 and it really brought some life into the sound. I tried the same tone levels on movies and TV and it sounds more defined as well. Is it recommended you leave the tone at 0 for "natural" sound?