that the soundcard is broken but possible. try another set of speakers in it if you have any. Otherwise call whoever you got them from and tell them you would like a replacement as the ones you have don't appear to be working correctly.
If PC speakers are anything like "real" band speakers, it sound's like a connection problem in the sub (our bass player had the same problem with a Trace Elliott Bass Guitar Amp).
Disconnect the sub and try the other speakers oin their own. If they work, you can assume that the soundcard is likely ok. Otherwise it may be a frequency crossover problem but I don't think that's very adjustable on a PC (unlike a mixing desk!)
I too (3 weeks ago) purchased a set of Creative 6.1 speakers and Augidy 2 soundcard.
While I haven't had the problems you have reported I have found bass control to be problematic sometimes bloomy sometimes not and this is particular apparent if bass is adjusted using the remote.
I also have noted that the speakers "hiss" audibly even on relatively low level of 3. I'm at the point where I think I may be taking them back (to PC World) since they haven't exactly lived up to the billing they have had in PC Mags.
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