This will also happen if something internal in the amp has gone afoul and is causing either major excessive current draw such as a dead short or fets stuck wide open that are about ready to blow. if you ever get an amp that starts popping all of the internal fuses, be very careful how many times you try and replace them. Once you may get lucky but usually come the 2nd or 3rd set you will let the magic smoke out of the amp and its either time for a repair if the amp is decent enough to try and repair or its time to throw it in the dumpster and look for a better amp as a replacement.
"THE EXCESSIVE CURRENT DRAW FROM A DEAD SHORT" COULD THAT CAUSE VOICE COILS TO BURN?