I recently purchased a Marantz SR 5200. It seems pretty good. I am running six speakers (dirrerent varieties) and two sub-woofers. The system includes a rear surround speaker. When I play DTS-ES movies like Gladiator and The Haunting, the display on the front of the receiver lights up and tellsme its receiving a signal for a rear channel. When I play Dolby Digital EX movies this rear channel does not light up (its receiving only 5.1) Does anyone out there know how these generic 6.1 systems work? I am wondering if they have the ability to pick up the Dolby EX signal or not. It seems to work,but how true is it? And what about DTS ES. I realize it is a matrix, but is the hardware (chip) any good?