Question about JBL PRX518S Subwoofer Speaker

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Hi, I have 2 JBL Subs PRX 518S (and 2 PRX 535). At a gig a few months ago both subs suddenly went "dead" . The powerlight went out, and the did not restart after powering down. The Crown-amps were repaired. One works perfectly now, the other one is repaired 2 times now, but every time I build it in the sub and plug the speaker in the amp goes "dead" again ! Dirk at Werchter Belgium Europe

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I had to buy a complete amp and replace the old

Posted on Oct 07, 2010

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No more subs in jbl prx-512m


First check the speaker with a multimeter.

If it is OK, then check/repair the Class D amp that drives the speaker,

up to the input stage.


There are board part numbers printed on the PCB and some are

available on line.

Have a tech to guide you ,should you feel to Diy.

Oct 17, 2012 | JBL New Jbl Prx512m 12 Powered Monitor...

1 Answer

No more subs in jbl prx-512m


Pull the input plate off of the back, there are usually light bulbs in there that act as fuses

Oct 17, 2012 | JBL New Jbl Prx512m 12 Powered Monitor...

1 Answer

My bass cuts when playing but goes back on after a few seconds.


that because you have a loose ground to your amp or not the right size wire but check your ground on the amp it will overheat and turn off to protect itself .

Apr 13, 2012 | JBL PRX 518S PRX518S Powered Subwoofer PA...

1 Answer

Played at a gig last night when one of my jblprx518 subs cut out also there was a smell as if something had burnt out! Is there a simple quick fix or is it a warranty issue?


Either the speaker or the amp in it or both fried. Check to see IF your warranty will cover the repair.
Make sure that in your venues ALL interconnected equipment is powered from teh same receptacle OR power conditioner module, incling mixers, amps, speakers. Ground bounceof wiring in building power that causes damage most likely will not be covered under warranty.

Jul 31, 2011 | JBL PRX 518S PRX518S Powered Subwoofer PA...

1 Answer

Busted Kicker Subs


hi not worth fixing as labor is to high.

look around on ebay make sure you replace them with a name brand some companies like JBL sell refurbished subs with full warranties for cheap.

Remember with subs you must have a crossover either electronic or just a component in the cabinet so that the speaker is only reproducing the correct frequencies.

Lastly 12" subs require a ton of clean power 200 watts per ch minimum..and if possible they should be either 1 channel amps or bridged to 1 channel meaning for a pair of 12's you would have 2 amps

Contrary to popular belief most subs are damaged because people overdrive their amps and that blows the voice coil

hope that helps

Jan 24, 2010 | Car Audio & Video

2 Answers

JBL amp, worked fine untill 2 days ago. protection light on..


might have roasted your speakers voice coils a little which may be sending the amp into protect mode throw a speaker on it that you know works and if it doesnt trigger the protect circuit then you probably have a blown or almost sub.

Jan 02, 2010 | JBL BP1200.1 Car Audio Amplifier

1 Answer

Amp Issues


1) Make sure a bridged load of no less than 4 ohms is applied.
2) make sure both the left & right channels are working.

Jan 29, 2008 | Rockford Fosgate Punch P2002 Car Audio...

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