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Check for any ground loop that might have got mixed up with the amp power supply. Certain speakers also have inbuilt active crossovers which are wire wound inductors. And inductors and notorious for picking up stray emf's. Also try and filter the amp power supply. For that you can use a...

Does the light blink when you turn it on ? If not then there is a problem with the radio or the power supply if the light in "ON" then check the speaker wires for any short circuit. There is also a possibility that the power amp chip has blown. Huntington Beach Toyota

There can be many causes - 1. Probably you have blown up the output capacitor. 2. Your speaker wires might be getting shielded. That would result in grounding of the current loop. 3. Your O/P amp IC has blown up and only one channel is working. 4. Your speaker coils / cones might...