Since most material out there is NON DD-EX,DTS-ES encoded I am curious if my Denon AVR-4800 THX ULTRA 1 certified can extract rear information from NON DD-EX,DTS-ES Like a regular title 5.1 title? The argument is that if It can then great. But if not by having your speakers configured in a 7.1 configuration with the side surrounds directly at the sides and not slightly behind on the side walls you will loose your rear center imaging if the processor is not capable of re routing that matrix information to the back to rear speakers. I know the matrix information gets routed in DD-EX encoded titles. But what about regular DD titles? Are the 2 back speakers silent effectivly making your 7.1 speaker configuration horrible for rear imaging in 5.1 stuff?