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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  • ryanman Nov 16, 2007

    thanks for the help but i took it to a show and i guess the person who installed it hooked up the remote cable wrong.



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  • 631 Answers

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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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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I looked up the correct way to wire my JL 13.5W7 1.5. Therefore it said to wire it in parrallel. I understand this will put it at .75 ohm. As I start to turn it up it sounds great, very loud but once the...

1000/1v2 Class D Monoblock Subwoofer Amplifier Specifications:

Rated Power:
1000 W RMS @ 1.5 ohm - 4 ohm (11V-14.5V)

THD at Rated Power:
<0.05% @ 4 ohm

S/N Ratio:
>95dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth)

Frequency Response:
5 Hz - 250 Hz (+0, -1dB)

Damping Factor:
>500 @ 4 ohm / 50 Hz

According to the chart your amp is only stable down to 1.5 Ohms, so running at .75 Ohms the noise you are hearing is the amp clipping (running more power than it can handle at low ohms)
I would suggest wiring it in series, or you could adjust the gain on the amp until the popping goes away.

Hope this helps.

Nov 10, 2010 | Jl Audio 13W7 Car Subwoofer

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I hooked up my two 10 inch JL Audio W3v2 2 ohms to a mono JL Audio 500.1 amp and the subs will not work. I have the subs wired in a series. I then hooked them up to my friends amp and the subs worked. Any...

try one at a time. if they work then try hooking them up differently. if none work, then check to see that your amp is not in protect mode. if amp is ok, then check to make sure you have your rcas connected to your amp. in other words, re-check all your wiring. if still nothing, try your amp on your friends car and vise versa.

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

Jul 02, 2009 | Jl Audio 250/1 Car Audio Amplifier

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its not the amps my dude ur ohm loading is wrong if u have a 4 ohm stabled amp n ur speakers r 2 ohms naw thats not gonna fly caus it cant put out what ur asking 4 so u need 2 reload ur subs try this link this should help u out n save u money

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My amp shuts off with my 12in w6's when i turn up the volume

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Also your LPF filter could be set too high.

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It depends on how much power/watts and ohms your amp is stable at if it stable at a 1/2 ohm then you can bridge them in series and this will lower the ohms of the speakers to 2 ohms

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