I hooked up these two components via the Optical intput/output on each of them, expecting to use the dolby dts decoder on the receiver. For some reason, when I put DVDs that I know have 5.1 capability, ID4 and Phantom Menace for example, the receiver only recognizes it as ProLogic. Both pieces of equipment are new, orginally with no customized settings. Of course I changed things trying to figure out the problem, but to no avail. I have another setup with a different DVD player, a Panasonic RV-30 I think, when I hooked them up via Optical, it immediately recognized the DVD as Dolby with 5.1 and it sounded great. a didn't have to do any setup on the DVD player, and on the Receiver (which I did do in the first paragraph) I set the DVD to use the Optical input. I would have thought that the Sony would have "recognized" the Sony "automatically". Any ideas on what I should look for in either the DVD setup or the Receiver setup? Also, does anyone think I should also post this issue in the Audio/Video fourm? Thanks for your help.