My Clarion APX480M amp will power on(the green LED is lit up on the amp) and sound comes out of the speakers, but the music is very hollow sounding. The subwoofer amp is also making a hissing/scratchy sound that you can hear when you hold your ear up to it. I have two of these amps in my boat so I am not sure if the problem is the stereo or amp(s). I have one driving 4 7" clarion speakers and the other is driving 2 subwoofers. Either way, I went from sounding cool on the water to not being heard at all.....:):) Any help is greatly appreciated.
This sounds like a signal problem. Make sure that all of your signal cables are plugged in fully. If all are, you need to check for coninuity between the shield ground of the head unit's RCA jacks and the case of the head unit. With no RCAs plugged into the head unit, you should read ~0 ohms between the shield of the RCA jacks and the case of the head unit.
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Sounds like an attempted amp/PA mixer repair to me. Plug a guitar or music source into one of the inputs and see if you hear anything. Honestly, the protection relay circuits rarely go bad but instead are reacting to problems elsewhere in the circuitry. Good luck.
try to unplug each speaker one by one while playing it. There can be a defective speaker that grounds out at the speaker terminal or internally causing the amp to go into protection causing all the speakers to go out.
make sure the speaker wires in the car do not have one side grounded.the output on the clarion is a floating output and cannot be grounded.the best solution is to look at the wiring on each of the speakers,and match them out to the ones on the clarion.the most common colr code is white front left,gray front right green rear left and purple rear right.each speaker has a plus and minus.mixing them up will result in the speakers being out of phase and result in poor bass performance.i would wire the wires directly to the clarion using crimp connectors.the first thing i would do is power up the stereo out of the car to 12 volts,and using a speaker make sure you have sound coming out.the yellow wire which is the clock/memory is a must to be connected to constant 12 volts or no sound can result
sounds like a short in your wiring to your speakers the best thing to do to check this is run a speaker wire directly to the speaker from the stereo check it that way and see if it works.If that don't work it's the wires on the stereo connection.The speaker wires on most aftermarket stereos are mostly colored 2 of each green,purple,white & grey.