I recently completed aqisition of all my HT elements. They are Onkyo SR503, Infinity TSS-750 satelites and a Athena AS-P4000 Sub. In addition to that I have a Pioneer DVD Player/writer. When I play DVDs, I don't get much of a sound from my surround speakers. I only have a 5.1 set up so speakers in the back, they don't give much of a sound outpt. I am trying to identify reasons for that. What I think is 1. Receiver is for 7.1 set up so it has surround back and surround terminals in the back. - I am connecting my speakers to Surround terminals. - Am I right? 2. I am using regular red,white,yellow cables to feed my receiver from DVD player. I need digital input (COAX and Fiber optic ) - Am I right? Thanks in advance.