I am very dissappointed in the sound in Halo 3. My system is set up properly and caibrated and sounds great for music, movies and all my other xbox games (investing lots of time in Mass Effect:D), however the multichannel 5.1 for Halo 3 sucks. I do not think the game supports dolby digital 5.1 because it does not utilize the centre channel very effectively to not at all. The sound is not balanced, the guns are underpowered and to get any effect for the sound of the guns you have to turn the volume way up but then the voices are extremly extremly loud when they kick in. This sound inbalance between the guns and the voices are extremely bad. Oh and by the way their are no sound options in the game to customize (voices, music etc). Also, i get some delay on the odd occasion when firing the smg(maybe it is when the game is loading)...i do not get this delay with any other game. I am quite baffled at why Bungie did not see this in testing. I might try the game in Pro-Logic II to see if that makes a difference because the game runs shotty in 5.1:mad:.