When playing a bluray the oppo player says its in 5.1 but my receiver is putting it in 2ch down mix and it wont let me put it in anything else. It doesnt do that with my PS3 or my xbox or my cable box I sure hope that once I get the center and 2 surrounds it doesnt do that. I do have a set of 5.1 direct input audio cables but HDMI should work any other ideas.