I ended up going with the Yamaha RXV-730 but got a couple questions. 1. it has a, and b speakers and I was wondering about this is can i be playing xbox on the a (surround speakers), and have my mp3 player hooked up to it to play through the B speakers? 2. Which one of these do I plug my sub woofer into: subwoofer output, or 6 channel input sub woofer? 3. where abouts would I plug in the rear center channel? I read the manual but iam still a little blurry about these areas.