My front channel amp and rear channel amp go into protection mode when my base hits. It only does it when my voltmeter is reading 14.4 volts. My sub and rear channels need 14.4 volts to get the proper power out of them since I have them in mono mode. If my voltage is less than 14.4 ususlly in the 13s I can pound as hard as I want but when the voltage gets up then those two amps kick into protection mode but my sub still hits
It may be faulty the amplifier or some of the speakers. Brand/model? Speaker power rate? Speaker wiring?