Hey guys I purchased a new amp in August its been running perfect till last Friday, I finished work got in my car started the car up got no sound from my doors speakers with seperate amp to my sub but my sub was working fine. I've took all the wires out my fli amp that's running 2 door speakers and 2 6x9 but protection light constantly on, I have swapped the wires over to my sub amp and it works fine, i put them back into my other amp and still the protection light is on apart from a faulty amp if it is what else could be causing the protection to come on?