[-0MEGA-]

I picked up a new Yamaha home theater system for my PC (instead of new PC speakers), since my Z-5300's pretty much died on me.

Anyways, I have the receiver connected to my PC using digital coax via SPDIF. I have heard that the X-Fi only outputs 2 channel audio via digital, but I also tried using my onboard sound which has optical as well as digital SPDIF. Right now it's connected to the onboard sound card with the X-Fi disabled, however on the receiver it's only showing that the Left and Right speakers are being used.

I have tried several of the different modes and I am now on the Pro Logic mode. Now audio is coming out of all the speakers, and I can hear a difference between the center and L/R speakers (IE when I throw a grenade). Although I don't hear anything from behind be when I throw a grenade for instance. It seems like the surround L/R speakers are playing the same audio as the front L/R.

Now heres the real kicker. When I go to the sound control panel in Vista, I can run a test on the DTS audio and the receiver shows that all the speakers are being used (FL, Center, FR, RL, RR). I haven't figured out if theres a way to run DTS audio for everything or not. So if anyone has any input, it would be great!

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Core 2 Duo E8400 @ 3.83GHz
Gigabyte GA-P35-DS3L
ATI HD 3870 GDDR4 @ (840/2332)
4GB (2x 2GB) DDR2-850
500GB SATAII HD w/16MB
SilverStone 750W +12V@60A
3DMark06: 11593