JL 300/4 Low Impedence?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=78432
Printed Date: July 06, 2025 at 4:47 PM

Topic: JL 300/4 Low Impedence?

Posted By: dsbenjamin
Subject: JL 300/4 Low Impedence?
Date Posted: May 29, 2006 at 1:44 PM

hey guys, I have a JL 300/4 amp powering 4 JL XR speakers. I don't have the setup bridged at all so the speakers are running at 4 ohms. I know that amp has a 1.5 ohm stable so I don't think there should be a problem. but the speakers started sounding awful yesterday so i decided to go and tune the amp a little better, I realized that if i put the volume up the Low Impedence light will blink when bass hits, the volume isnt too loud its actually set at a pretty decent level when the light blinks. Does anyone know what i could try. I didnt really mess with the frequency on the amp because the speakers have crossovers. And i didn't check for any shorts but i'm thinking if there are shorts the light would always be on. Well any feedback would help. Thanks A lot.

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D.S.B.

Replies:

Posted By: DYohn
Date Posted: May 29, 2006 at 3:04 PM

You say "the speakers started sounding awful yesterday." Was everything OK before this? If so, I bet you have blown one or more speakers, probably because your gain is too high and the amplifier has been clipping, or because you need to engage the HP filter to protect the speakers and you have been driving them beyond their mechanical limits. I suggest disconnecting all four speakers at the amp and then re-connecting them one at a time to see which one might be causing the problem. You will probably have to replace that (or those) speakers. Also, it is possible the amp has died, so if it seems to do the same thing with any of your speakers, before you replace all four I'd suggest taking the amp in to your JL dealer and have it tested.

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Posted By: jvillefinest
Date Posted: May 29, 2006 at 3:33 PM

I would do what DYohn said about going to the JL dealer. I sell JL at my store and every once in a while we get an amp that is doing what your saying and something has happend to the amp. But definatly check all other possible problems.

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2007 Acura TSX
SQ setup in the works

Posted By: dsbenjamin
Date Posted: May 29, 2006 at 6:49 PM

thanks alot guys ill do that later on tonight...haha too hot in phoenix to be working inside my car at this time :)

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D.S.B.

Posted By: dsbenjamin
Date Posted: June 02, 2006 at 5:54 PM

thanks a lot guys....instead of unplugging the wires I just went into my audio control and went to every speaker and it handled well over 30 volume....except when i went to the front passenger It kept blinking low impedance at like 25 soo im sending it in for service monday thanks again

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D.S.B.