Guys, I'm running an older RCA dvd player through a new t743 I recently purchased. So far everythings great....until I added a center channel speaker. Now I'm getting nothing through the center speaker. I've tried multiple dvd's in every format. Could it be that the dvd player is not capable? It reads 5.1 on the receiver yet we're getting no sound from the center at all. Are there very few dvd's that actually read center channel, or are we doing something wrong? Any help would be appreciated.