Standard Bose radio blowing fuse

My radio keeps blowing it's fuse. The fuse located under the dash on the left side. It seems to be doing it only when I'm driving over bumps or making turns, which left me to think a bad wire. An audio shop said the wiring looks fine but that the amp or receiver is could be the problem. How can I be sure the that Radio receiver is bad and not the speaker amps? Can this be fixed?