Here is the low-down on the audigy 2 AFAIK - i used to own one.
If you want the best possible SQ, 24 bit, good re-sampling etc these are the settings you should choose.
First off, never use EAX effects, or CMSS, never run (if you have, re-install), the speaker calibration wizard, dont even install it preferably, never change the bass or treble settings with the surround mixer, just leave it at 50/50.
Use foobar2k, re-sample to 48khz or 96khz, 24 bit playback.
That is about all you can do with that card. It does not sound half bad if you have it setup properly, if you require it for gaming purposes, worth the money to invest in another soundcard for music playback however.