I have a Denon AVR-3802 that I've had for a little over a year now and am in the process of installing rear center channel speakers. I know the unit doesn't decode "authorized" Dolby Digital Surround EX, but according to the Denon website, it does "Dolby Digital decoding, including Matrix 6.1 decoding". The manual under Dolby Digital 6.1 notes that the rear center channel is not available. Does this unit decode Dolby Digital 6.1 or not? Is the only way to do it through Denon's proprietary "Widescreen 7.1"? If so, how is the sound of the "Widescreen 7.1"? Thanks in advance!