Question about Jl Audio 250/1 Car Audio Amplifier

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Help I have a jl audio 250x1 amp was working well but now i have to ground the rca's in order for sound to come out didnt have to before dont know what happened i have to ground the outside of the rca or else only a little bit of sound comes out

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Re: Help

Check the earthing of the amp is adequate. It sounds like the amp is floating without an earth until you earth the rca outer.

Posted on Apr 24, 2007

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I recently got a JL 300 amp and at first the sub stopped working, then it came back on during the song I was playing. Later on it shut off all together. I don't know what the problem is..

Does it only happen on that channel. It is a 4 channel amp so make sure the other channels are working. It sounds like an RCA input prob. Try the sub on the other channel. if it works then it would be your RCA input needs resoldered.

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Go back to where you got it installed and ask them to fix it.

If you don't want to do that I would recommend going to another good car audio shop and getting them to check it out.

You can test it yourself by hooking up an iPod to it using a Headphone to RCA cable.. test at low volume first.

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Yes it possible that the inputs have been damaged on the circuit board of the amp. If the amp has hi level inputs you could try running a speaker wire input to it and see if it works. You might try another pair of rca cables to.

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This could be due to multiple things. First I would run a test light to the speaker leads of the amp as if you were running your should light up and blink to the sound of music coming through. If no sound then most likely your RCA cables are bad or input jackets on the amp are loose and be shorting out causing the low light to come on. If you know 100 percent that you bought that amp in good running condition then most likely its something simple like the RCA wires are bad..Hope this kind of helps you out.

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Disconnect all speaker wires from the amp and disconnect the RCA cables from the amp. If it still goes into protect mode, use a multimeter to confirm that you have 12v on the B+ and remote terminals. Place the black meter probe on the ground terminal of the amp when measuring the voltage. If the voltage is sufficient and the amp goes into protect, it will have to be repaired. JL only accepts repairs from authorized dealers. You'll have to find one in your area or you'll have to find a repair shop willing to work on JL amps.

Let me know if you have any other questions.

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You need to check the shield ground on the head unit. The following link will guide you through the test procedure.

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