Originally posted by: darkswordsman17
You'd have to get a mini-plug to digital coaxial adapter cable (unless you get the higher up ones with the front panel or external panel) since the X-Fi only has digital out through its mini-plug port.
As far as output goes, it can pass a signal (say DD5.1 or DTS thats being decoded from a DVD), but it won't encode anything that isn't a readily passable signal into a surround signal. So if you've got a game, the only way you'd get multichannel audio from the X-Fi is to either run direct analog connections to your reciever (like you would for DVD-A or SACD), in which case your reciever is just working as an amplifier. Otherwise it will just send a stereo signal (which you then could have your reciever upmix using Dolby Pro Logic or DTS Neo:6, but it won't be a true surround signal).
There's a card, I can't recall who makes it, but it features DDL and DTS Connect, and is supposed to be pretty good. The only problem is that for games, you'll have a framerate hit.
So you could still get multichannel audio from an X-Fi but you'd have to run analog cables from the mini-plug on it to your reciever, which most people do not want to do.
If this if for a home theater PC I'd recommend the other card. It costs about the same as an X-Fi Xtreme Music.