This is what happens to an amp when you are playing with speaker wires n shit while the unit is powered up, and rocking. Notice that there is NO POWER APPLIED at this moment. With meters being near impossible to get, this will be an expensive mistake by the current owner. AND, even though I warranty my amps for life, blowing them up because of procedural errors is NOT COVERED. Never mess with a powered up amp. Power it down and mess with connections.