Question about Jl Audio 300/4 Car Audio Amplifier

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JL audio 300/4 amplifier noise

I have engine noise coming through the speakers, only when the car is turned on....Can anybody help?

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This can be a faulty ground or speaker wires running to close to other wires from the car. You can also buy a filter for the speaker wires.

Posted on Oct 28, 2007

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1 Answer

ENGINE NOISE COMING OUT THRU MY SPEAKERS


check how secure your earth strap is for the amp, mabye try thicker cable, you can get interference suppressors as well which may help and are cheap.

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the ones directly across from the burnt ones is the same value

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Jl audio 1000/1 low voltage -keeps shutting off at high volume


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 !!!!!!!

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JL 300/V2 shuts down


you may have a weak power supply, check for proper ground ( clean contacts with a tight bolt to chassis), or too low speaker impedance because too many speakers or shorted speakers or leads to ground.

Apr 10, 2009 | Jl Audio 300/2 Car Audio Amplifier

2 Answers

Blown fuse


What size fuse are you using?

Have you checked the speaker to determine if it's damaged?

Do the speaker and amp produce clean sound up to the point where the fuse blows?

Aug 06, 2008 | Jl Audio 1000/1 Car Audio Amplifier

1 Answer

JL 300/4


maybe the remote power lead for the high's amplifier is loose...

May 17, 2008 | Jl Audio 300/4 Car Audio Amplifier

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.

Jan 09, 2008 | Jl Audio 300/4 Car Audio Amplifier

1 Answer

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.

Service FAQs

Dec 04, 2007 | Jl Audio 300/4 Car Audio Amplifier

1 Answer

JL audio Low ohms indication


If the low impedance light is coming on, you may have shorted wiring or a defective speaker. Disconnect all of the speaker wires from the amp. If the light does not come on, reconnect one speaker at a time to see if you can find the one causing the problem. If the first one you connect causes the problem try a second one. If the light comes on with no speakers connected to the amplifier, the amplifier is in need of repair.

Oct 05, 2007 | Jl Audio 300/4 Car Audio Amplifier

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