I know this is a newbie type question, but I just had a room done with a 7.1 speaker set up and an Onkyo TX-SR 805 AV receiver to drive it all. I have a HD set top box, a PS3 and for some reason a DVD (redundant with PS3) all connected via HDMI. I am a bit confused on which surround sound option to choose for the different inputs. I would like to always use all the speakers, even if the rear and side are putting out the same sound. Any help here would be greatly appreciated.