I am assuming that by "sound blaster", you mean the Infinity Amplifier.
Fuse 23 does indeed power the amp which is located at the front of the passenger foot well.
Pull back the carpet, there are 10mm plastic nuts securing the metal frame that mounts the amp and the TCM on automatics.

Kinda sounds like you are in the market for a replacement amp, unless you or a friend are electronics geniuses.