Just a thought like that: did you try configuring your system in 4.1 (tell your receiver there is no central channel)? If you have the same issue, then it is something coming from the source path. If you don't have the problem, the definitely look at phases (+- speaker wires) as it is a frequently overlooked source of problems.
I'll give that a shot. I'm almost positive I don't have any phase problems. My wire is copper colored on 1 side and silver on the other and I'm very careful when I connect the speakers. Also I believe that Audyssey would have told me if I had a speaker out of phase.
I asked earlier if DVD players such as the Oppos would make a big difference as far as sound when compared to a player/recorder such as the Panasonic DMR-EZ28K that I'm using. Would you know about that?
