What kind of inputs do the speakers have?
It kind of sounds like these are hometheater speakers and you're trying to plug them into a regular soundcard. Do they have 3 1/8" jacks for L/R, Center/Sub, and Surround L/ Surround R? If they don't have that, you're not going to get the standard sound you'd get from regular computer speakers.
How do you have the speakers hooked up to the soundcard now?[/quote]
When I look behind the sub I see AC3_input_channel 1 with 6 inputs:FR/Fl, SR/SL, SUB, CENTR; input_channel_2 with 6: TV(R/L), dvd(VCD)(OR SOMETHING LIKE THAT)(R/L), TAPE (R/L); and 1 difficult (I don't remember its technical name) input where I Pluged my soundcard outputs. Then there are 10 otputs for speakers (+/- or something like that). I see some kind of optical input.
I have 3 output wires from soundcard (the first is FR/FL, the second is SR/SL, the third is CT/SUB). Then they fade into (merge) one difficult output (I don't remember its technical name) that is pluged into my sub (as I've described above).
My soundcard has Rear panel that is active know and front panel that is not active.
Rear panel has 6 polychromatic outputs (I have a little trouble with colours

): green,black,orange,gray ... and don't remember

Their output information is under control of XEAR (I can choose any of speakers for any output)
Actually I'm not at home.