Sorry to ask the silly newbie question, but I've reached the logical end of my (limited) knowledge.
I have a Denon AVR-1505. Here is my issue. When I'm watching TV monitered through the AVR, the sound is fine. When I watch a DVD (connected through optical) the sound is barely audible. If I switch to straight stereo, I get the full volume again but no surround effect. I've read through the owner's manual several times looking for an answer with no luck.