Question about Jl Audio 1000/1 Car Audio Amplifier

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Power issue I have a jl 1000 connected to 2 alpine 12" type r. everytime I get a deep bass my amp cuts off with low voltage. I have a 4 gauge wire going to it. Also the lights of my car blinks when I turn the volume up when the bass hits. whats my prob ?

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Re: power issue - Jl Audio 1000/1 Car Audio Amplifier Car Amplifiers

You just need a high output alternator

Posted on May 30, 2008

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Re: power issue

Hello highs31 Ok this is a common problem and the fix is quite easy. even though you may not want to hear it. Here it goes: Your amplifier is drawing more current then your alternator can put out and more then your voltage regulator can control. This means that you must and I repeat must add another battery, alternator, and voltage regulator for your sound system. adding these components will eliminate your problems. That is the long and the short of it. I hope this helps, Thank you, Shuttle83

Posted on Oct 09, 2007

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Jl audio

If the amp was hot, it probably has a serious problem. You should have it checked out by a qualified tech. Don't continue to use it. More serious damage could occur.

May 29, 2008 | Jl Audio 1000/1 Car Audio Amplifier

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Jl 1000/1 amp not working

If I'm not mistaken, the blue light is the low voltage indicator. You need to confirm that the voltage ON THE POWER SUPPLY TERMINALS of the amp never drops below 11 volts. If it does, the amp will shut off. It's possible that you have a bad connection or even a defective fuse that's causing the problem.

JL recommends a 100 amp fuse for the amp. If you use a fuse that's too large and something goes wrong, the amp may be very severely damaged (possibly beyond repair).

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2 Answers

Blue low voltage light

You most likely need a bigger alt. The low voltage light comes on simply because your alt. isn't producing enough to feed the demand.

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1 Answer


JL amps are somewhat sensitive to low voltage. Everything has to be perfect in the power supply feeding the amp. I'll assume that you have large enough wire. Check the owner's manual on the JL site. They likely recommend 4g or larger. You need to measure the voltage across the B+ and ground terminals of the amp. If it's dropping below ~11v when you turn the volume up, you need to determine why. Make the same measurements at the battery terminals. If there is significantly less voltage drop there when the volume is increased, check all of the points in the circuit where there could be a bad connection. Look for corrosion, over-heated connection on fuses or at the battery and make sure the fuse is in good physical condition. Some types tend to overheat and melt. If everything looks OK, begin measuring the voltage at each point where there is any sort of connector. If for example, you get a significant difference in the voltage on each side of the fuse, the fuse, the holder or the connections to the holder may be defective.

Oct 04, 2007 | Jl Audio 1000/1 Car Audio Amplifier

2 Answers

Amp cuts off

You may have a problem with the power source feeding the amp. You need to check the voltage across the amplifier's B+ and ground terminals when the amp is playing/cutting off. If it's dropping below ~11 volts, you need to determine why it's dropping so low.

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