To those who think that they are having problems with HALO in 5.1, specifically that center channel not functioning properly: I just don't think that they use the center channel very much in Halo. Every game I play on my XBox is output in a Dolby Digital stream, at least my Yamaha seems to think so. Whether the games uses all the channels or not, that is a different story. Anyways, Madden 2002 uses the center channel for dialogue perfectly. I've heard some activity from my center in Halo, just not alot. I really don't think people should be returning their XBox thinking the encoder is screwed up or something.