Question about Jl Audio 500/1 Car Audio Amplifier

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No sound I have 500/1 running 2 12's, (8gauge power and ground wire). One day all of a sudden heard a boom followed by the subs putting out a huge constant noise. I disconnected it from the power and when i reconnected it it powers up but nothing else. No sound coming from the subs. Power light is on but the other two lights are off. Is there anything i can check myself that could be an easy fix or identification of the problem. i hadn't changed anything to do with the wiring or anything since i have had the amp so the problem was an unexpected surprise. I would love to keep this amp so any help would be much appreciated.

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As u have speakers with u u connect another speaker in to the sub connection and reduce the volume to min and check if sound is coming use another wire to connect the speaker to the amp and if it is working u check the cable then the sub it would have burned off due to some internal problems and it has to be checked by a technician this problem may be due to wire broken or something like that

Posted on Jul 03, 2007

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unfortunately that's going to be a labor intensive project. You will have to follow the wires to where they go and make sure that they are all tight.

Being that the sub stays on you know you are looking for a loose wire off the other amplifier or the head unit depending on how you are powering those speakers.

if you have two amps one for the subs and one for the mains its probably not the power or ground going to them since both are not shutting down but check where the power splits to each amp.


start at the amp that isn't working unhook the cables. Test that those cables have power and proper ground then make sure they go back on cleanly (no loose strands) and tightly. proceed to follow the power wires to where they are connected.and double check everything.

If you have access to a continuity and voltage tester that will make it a bit simpler.

Depending on how clean an install it is (no panels, speaker boxes amps or seats to remove) it shouldn't take more than an hour or so. I always recommend that connections to power blocks remain easily accessible as I have had to remove amps, subs and junk like neon to get at wiring and its always a nightmare.

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you could have too small of wiring going to the amp for one.. you need to check the ohm load that you have the subs wired at to the amp... this is a HUGE reason for amps not putting out like they should... If it's low of an ohm load for the amp then the amp will act funny and shut off a lot... if you leave it like that it can fry the amp.

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