Just bought a new reciever Pioneer VSX-821-k to replace a 9 yr old home theater system (very low end). I'm having a problem getting rid of an echo when playing DVDs. The sound from the cable box is good, but when a DVD, Indy Jones and H Potter I get an echo like I'l listening to it in a school gym. I've changed the suround sound themes and speaker set up, with no change that I can detect. What am I missing? The manual has a lot of options but nothing that says "if you have unwanted echo....." BTW I'm not a audiophile. I did serarch the internet but I turned up nothing.