Question about Jl Audio 250/1 Car Audio Amplifier

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Sub makes loud noise when car is shut off

I have the jl 250/1 amp and a jl 12in w3v2 and when i shut off my car a loud rumbling noice comes out of my sub. this only happens when the radio is turned on. the remote light on my amp takes around 20 seconds to turn off. could that be the problem?

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Re: sub makes loud noise when car is shut off

Does it make noise if the RCAs are unplugged? If not, the RCA shield on your head unit may be burned open.

If the amplifier is set to signal sense, it will take longer for the power light to go off.

Posted on Nov 13, 2007

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I have a Jl Audio 250/1 mono block amp and the thermal light keeps coming on what could be causing this?

It could be a number of things? 1 to many subs, speakers wired to the amp causing it to overheat and making the thermal light come on. 2 It all depends were your amp is. If it's clear and nothing covering it, obstructing it, Ie sub in front of it, amp inbetween the rear seats and sub.

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JL audio 250/1 not powerful enough for pioneer TS-W307D4?

you should move up to more power....underpowering subs is bad! try not to go under the subs rms by 5o watts?

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1 10 jl jl 250/1 mono block amp cuts off an on help

your subwoofer is wired incorrectly to your amplifier. Figure out which ohm load of subs you have and then what ohm load options your amp is stable at. Next go to either the Crutchfield website. find their learning center. go to subwoofer wiring diagrams. or go to and find their section on it

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I would try running the subs in parallel. Pos to Pos Dual Voice, Neg to Neg Dual Voice. Then Run + to + stereo - to - stereo on both channels.
So you have + and - running to one channel and + and - running to the other channel.
Also your LPF filter could be set too high.

Feb 07, 2009 | Jl Audio 500/1 Car Audio Amplifier

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there could b allot of factors involving this problem first could and most important is to make sure theres no loose connections in your wiring and find out how ur subs are wired in. are they SVC or DVC (single and duel voice coils) also what are theyre impedences if SVC could be 2, 4, or 8 also the same as DVC but jus 2 sets of terminals. find out first then the reason i ask is cause allot of half way manufactures are installing a device u could say that will cause amps to automatically cut off when the load on the amp reaches its lowest impedence load so when ur subs are moving in and out that load varies with how far the sub is extending out jus cause a sub say its a 4 ohm SVC doesnt mean that when its pounding away the load may actually be 3 ohm when fully extended. find out these variables first and then reply and ill let u know what to do properly.

Jan 16, 2009 | Jl Audio 250/1 Car Audio Amplifier

1 Answer

If my jl amp e1200 is on green, but no power is going to the sub

your audio wires from the head unit have been pinched or discontected or the head unit is not putting out a signal

Nov 29, 2008 | Jl Audio E1200 Car Audio Amplifier

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My jl Auido 250/1 amp

You may have a bad output on the amplifier. I would recommend taking it to a local electronics repair to have fixed, or visit a local stereo shop - preferably a JL Audio dealer. Visit their website at to find a dealer near you. You can have your amplifier sent in to JL Audio for repair by an authorized dealer and you'll get a warranty on the repair work.

Sep 27, 2008 | Jl Audio 250/1 Car Audio Amplifier

1 Answer

Added another amp to system now subs dont hit as hard

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

Sealed subwoofer box with two 10" jl audio subs hooked up to jl audio 250/1

you mite have the gain to high turn it down a bit just because there's a max gain doesn't mean you need to use it . you mite have to turn the bass boost up. you should get a bit better sound out of it

Dec 12, 2007 | Jl Audio 250/1 Car Audio Amplifier

1 Answer

Jl amp

the overload protector of your unit it so sinsitive try to cutof the overload relay and then observe 20 min. monitor the allominum heatsink the temp. normal

Aug 27, 2007 | Jl Audio 250/1 Car Audio Amplifier

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