I have a similar question/problem. I output my SBLive out a riser card to a toslink converter to my Yamaha 5.1 system, and no matter what I do it reads it as an analogue source. The best audiophile cards, as near as I can tell, are the Terratec DMX cards, but I don't know if they output a true digital signal. My DVD has much better sound with its digital out.
Dang, I bought a higher end Yamaha 5.1 receiver that I'd be loath to part with. But if you have a lot of money, and are using your PC as an integated component in your AVS system already... Full system integration can't be that far off.
A forum community dedicated to home theater owners and enthusiasts. Come join the discussion about home audio/video, TVs, projectors, screens, receivers, speakers, projects, DIY’s, product reviews, accessories, classifieds, and more!