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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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 power wire and the remote wire have voltage. at least 12 volts. make sure the ground wire is good and has a good solid ground. after that make sure the rca cables are getting signal from the radio. if you have a small speaker or tweeter you can touch the wires from the speaker to the rca cables and it should play music very quietly. meter the subs and make sure theyre ok and not shorted or bad. if all that checks out good.... the amp is probably bad. start with all the simple stuff and work youre way up. if the amp has good power and signal and good speakers then the only thing thats left is the amp. good luck
the amp is going into protect mode due to something wrong in the amp or some thing in the wiring to it ooh yea if you are getting 18v power to the amp that is way to high it should not be higher then 15v if the amp is in protect mode it will not play at all.
This is common when the output transistors have failed. The amp powers up and the amp senses a problem and goes into protection mode. Generally, there is a protection LED but not all amps have them.
To be sure that the problem is not installation related, check the DC voltage across B+ and ground when the amp tries to power up. If the voltage remains above 11 volts, the problem is almost certainly due to a failed component in the amplifier.
Disconnect the signal lines and all speakers (disconnect the wires from the amp terminals) and try to power it up. If it powers up, you could have a defective speaker or defective wiring. If the amp still fails to power up, the amp should be checked by a qualified tech.