In regards to the person inquiring about 5.1 Decoding Sound Cards and Klipsch 4.1:
I currently have a Sound Blaster Platinum 5.1, Klipsch 4.1 Speakers, Creative Labs Dxr3 Hardware Decoder card, and a 12X Creative Labs Encore DVD setup. As mentioned before the Speakers are analog and connect into the analog jacks in back of the Sound Blaster Live 5.1. The Dxr3 Hardware MPEG II decoding along with some player software allow you to downmix 5.1 Dolby Digital encoding on a DVD Movie to 4.1 Analog. It acts in conjunction with the sound cards ability to channel front left, front right, rear left, and rear right. The center channel (as mentioned before) is phantomized. In comparison to this I have a full blown professional digital 7.1 system in my home and proportionally speaking the setup that I have on my PC with things mentioned above are pretty comparable. Granted you can't beat a full blown high end digital system, but when it comes to a small system that can reproduce near the quality sound for the amount of money you pay, the CV (Customer Value) or BV(Benefit Value)/Price Ratio is more than decent in comparison with other products on the market in the same class as the Klipsch 4.1. It truelly makes a mini theater like you have never heard before.