I have a question about tone controls on recievers. My current receiver is a Denon AVR-1603 and it appears that the tone controls only affect the front 2 speakers in any surround mode (5.1 DD, Analog 6 ch input, 5 ch stereo etc) and not the centre or rears. Why is this???? This seems really bizarre to me. Basically I have to keep them at neutral so the fronts sound the same as the other speakers. Other than volume for each channel, there appears to be zero flexibility in adjusting the sound.....if you don't like it, tough Typically we can't here the lows and highs at low volumes so it sounds muffled unless I turn it up good. Trouble is I'm currently in an apartment and constantly have to be on the volume. Are other receivers like this to or are there some that allow tone controls to adjust ALL channels??? thanks.