Unfortunately I am using a Philips PSC-604, a crappy $20 soundcard I bought when I had my Creative 4400 4.1's. And then I got the Logitech Z-640, absolutly did not like them at all, and then got the Creative 6600 6.1's, I liked them all right. And then I got serious. I have wanted the PM 2.1 ever since I was in the fourth grade, which was six years ago. My school has had the PM 2.1 ever since fall of '98, and I fell in love with them. It doesnt sound right though, the PM 2.1 did not come out until 2000. But they have a cart with a 42" plasma TV, one of the older ones that the picture looks like crap. At the time it was well over $10k, so they thought since they had a top of the line TV, they wanted top of the line speakers to go with them. They ordered them directly from Klipsch, though. But anyways, I bought the PM 4.1's from eCost.com. Needless to say I an NOT doing business with them ever again!
But the card I want is the Creative Audigy 2 ZS. I wanted some thing that was THX certified. But on to the topic, the way you have it should be fine. I havent gotten a chance to check to see if I get all 4 working yet because I have it set on my soundcar to where all 4 work all the time. I hope this helps!