I was watching Harry Potter and the Order of the Phoenix on HD DVD last night with my 360 drive. I set the audio to TrueHD even though it only outputs at DD 5.1 on the 360. I didn't notice a difference between that and normal DD 5.1 while watching. However, the center channel seemed to be VERY quiet. Is this a problem with the disc or is the 360 via optical not as good as outputting audio as say a PS3 while watching The Dark Knight in comparison? My sound system was at volume level 13 for TDK the whole time, where for Harry Potter, I would have to set it to 30 to hear dialogue fine, and then turn it back down to 23 because it was too loud for everything else.