This is exactly what I wanted to highlight, from audio file to speaker output everything can be in pure digital form, so we do not have to be afraid about analog audio problem. Low-pass filter at the end basically work as average function which works with signal level much higher than for example noise. Thus in theory yes, at output is signal which can be considered as analog, but it is from obvious reason absolutely irrelevant when we would like to choose beast sound card - it is more like for academic discussion. ;)

But I do not want argue, I only mention it, because original question was for simple answer and it seems to me, that some answers can confuse people who do not have proper background. Personally I agreed with teceem who mentioned, that with analog audio should not be a problem if all is done and set correctly (ground loops, over saturated input, too low signal, etc.).

I'm glad with the offered answers, 'this but a bit late but now with actual field experience i can say that to make the most out of your soundbar ( or at least the creative stage ) it is best served with a nice audio card too. The integrated realtek solution almost everyone seems to be in possession does not offer the complete functionality and enhancement sets that the creative ae 5 dedicated soundcard offers

I see your point - I do sometimes get carried away with these things, I apologize. Being an electrical engineer by training does not help :). And, yes, I agree that with proper grounding "full analog" should be quite fine for most people.

Unless you go down the HDMI route, in which case your soundbar becomes the soundcard and your GPU the signal passthrough device :P.