There are two in the Instrument Panel Fuse Box #s 8 & 11 and one in the covered fuse box next to the battery in the engine bay that is a miniature 25 amp fuse in my 98, but if this fuse is blown it will take out all of your sound.
This has happened to me and now I need to troubleshoot the power circuit for the amps - Anyone got any good wiring references?