For the record, the PlayStation2 supports DTS and Dolby Digital 5.1-channel sound, so long as you have a receiver with the neccessary speaker outs to plug it into via the optical out. Thus, you are ...
As far as the PS2 goes, it sounds much better. I have a Denon 2802, and I plugged my DVD player into it through the optical out and couldn't really tell a huge difference, but when I plugged my ps2 in ...