When I was looking at a projection unit, I noticed alot simply don't have outputs for sound. It is something that needs to be check thoroughly before purchasing. Hopefully I'm wrong and someone knows more then I do on the subject(Not like that'd take a whole lot)
Easy, You go through a sound processor first instead of going straight to that. Or if you're going with HDMI then maybe there's an options to make those audio RCAs outputs instead of inputs?
A projector is video-only. It's like expecting an audio-only head unit to be able to do in-dash video //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
What does the Xbox have for audio outputs? I'm sure it has line-level audio of some kind...whether dual RCAs or even a breakout from a multipin connector.
If the 360 supports VGA or component out, I'd probably do it that way, but I'm masochistic and would take 5 BNCs over HDMI if given the choice, just for the flexibility //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif