Hi all, Don't know if I'm doing something wrong, but I can only get DD 5.1 from one of my receiver's output. Here's the set up: receiver has input/output for 3 dvd players. I connect my DVD changer to the receiver using the optical cable, and 5.1 comes out the speakers and is shown as such on the receiver's display. On my other 2 dvd players, I use RCA cables, and only get Dolby Pro Logic. Is using RCA the reason I can't get 5.1? If I sound like a newbie, that's because I am. Thanks!