Question about Jl Audio 300/4 Car Audio Amplifier

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Amp cell went bad!!!

I just recently was given a JL audio 300/4 amp for my new JL speakers and was told that a cell in the amp went bad and all id have to do is send it in and get it replaced. Does anyone have any idea on how much that would cost and if i should just scrap it and buy a new one?????

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Re: Amp cell went bad!!!

You may be able to find a local shop that can repair it. If you want to send it to JL for service, you'll have to go through an authorized dealer.

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Posted on Dec 04, 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.

Sep 04, 2011 | Jl Audio 300/4 Car Audio Amplifier

1 Answer

I have JL300/4. My front speakers starting popping and sounding bad, so I replaced them. When I turned the reciever on to listen to them, the right speaker started smoking. Could my amp be bad? The rear...

Well its not a good sign when your equipt starts smoking . Chances are that at least one channel of your amp is bad .But your real quest is to find out why the amp smoked in the first place. Chances are you have a shorted wire or speaker or both. Best way to check is is to check the wire with an ohm meter, if it reads less than 4 ohms you have a short .Next disconnect the speaker and check the wires to ground and measure the speaker. You need to do this before you repair or replace your amp or you will have it happen again. Noow it is possible the amp did fail on its own but the chances are it had help.

Jul 30, 2010 | Jl Audio 300/4 Car Audio Amplifier

2 Answers

Jl audio 300/4 low ohms light wont go off

If the low ohms light is on then you have your speakers wired to low. I need to know some more info like what type of speakers you have running on this amp and how many. Also was it working before and then it started doing this? Check the ohms with a volt meter if you know how, if not just get a volt/ohm meter and set it to the ohms setting and then take the positive(red probe) and touch it to the positive terminal on the speaker and then the negative(black probe) to the negative terminal and see what it reads. Make sure you check how low in ohms your amp is capable of handling. If you don't know just google the model of your amp and you will find a site that has a manual or just go to JL audios web site and you should find out there with no problem. Let me know what you find so I can assist you more if need be cause I also repair amplifires for a living and have many years experienc and I'm the cheapest amp repair business you will find any where. Good luck

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1 Answer

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You should definitely upgrade the power wire to the sub amp to 4 gauge -absolutely your choking your amp its starving for current-poor thing is starving !!!!!!!

Apr 16, 2009 | Jl Audio 1000/1 Car Audio Amplifier

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This sounds odd, but try putting your subs out of phase from the mains. Just see if it changes anything.

Feb 16, 2008 | Jl Audio 250/1 Car Audio Amplifier

1 Answer

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sounds like they have your sub amp in mono but they put the speakers in series which totally cancels the benefit of running your amp in mono. you will probably be happier if you just hook the left speaker to left plus and minus and the right to right plus and minus. Cuz even though subs aren't directional they do pass some higher frequencies that are and that dilutes the stereo effect.

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1 Answer

Scratchy single channel on amp

I had the same amp! It is the JL 300/4 and one of the chanels came in really fuzzy. It sounded as if the the wires were touching during my installation. I called JL and a JL authorized dealer it would have costed me 190 dollars total to get the amp fixed. Instead I opened up the amp to see if anything looked out of the ordinary. When you open the amp, see if the green fuse looking things are aligned. If they are not aligned then straighten them out. I think they had gotten out of place from being dropped becaue I baught my amp used. My amp works perfectly now!

This is no joke man, I did this just yesterday and was really excited to save 190 bucks. I'm not a technical guy or anything all I know is the green things are located behind the out puts inside the amp.

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3 Answers

Bad amplifier need help!!!!

if you unhook the rca's does it persist?

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1 Answer

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Best bet is to send it back to JL, they do not sell the PCB with all of the components loaded on it. Most likely the transistors in the power supply have fried. Open it up and see if you can find any physical damage. Google the part numbers of the bad parts, and you should be able to fix it relatively easily. is a great place for parts. Read this for more testing procedure: The whole site is wonderful, really.

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