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Jbl pb12 subwoofer stopped working; light out no sound

Started hearing loud "pops", sometimes one, sometimes two, about 3 weeks ago. Still worked. Just elevated us out of our seats for a second.
Then
four days ago, several seconds very very loud sound from woofer, then silence. Light went out.
We figured the woofer was toast and bought a replacement. Replacement did not work. Returned it. Tried our "dead" woofer on another system. Dead. Looks like the subwoofer output from the Yamaha receiver may be a problem (since the new woofer did not work) and the JBL PB 12 is dead. Fuse OK in woofer. No bad smells like toasted transformer. What do you think?
Thanks
Phil

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  • Anonymous Mar 17, 2009

    Light out no sound, removed back checked fuse its ok. Some discolor on circut board at resistors.

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3 Suggested Answers

  • 2 Answers

SOURCE: jbl PB12 powered sub woofer problem

These subs have had many problems, all associated with the amplifier section. PB 12's with an "M" as part of the ser. no. were assembled in Mexico and these are the ones with the amp problems. JBL fixed mine and sent it back no charge, BUT it cost me nearly $100 to send it to them in the first place. I have another one that has had no problems at all. Try sending it back for repair. At best you'll get a rebuilt unit back, at worst a substantial discount from the company for a new sub.

Posted on Aug 09, 2007

Monster80
  • 452 Answers

SOURCE: pb12 makes thumping sound after warming up

Hello there..Thats normal only if your sub volume and the pre amp is turned up..Your amp is the cause of the speaker jump..Turn amp volume sub level down a few and check your wire from sub to amp..If all of that is good is a normal operation for pre amp warm up in sub if level is turn to max..Try unplugging amp freom sub then turn sub on stand alone(just sub outlet plugged in and no wires from base amp plugged in..If sub stops the its the amp making the problem..If it still is there then the pre amp is either dusty on inside or the outlet plug that it is plugged in doesnt have a good ground..Hope these help to solve your problem..Have a great day...

Posted on Apr 03, 2009

  • 5 Answers

SOURCE: i blew the circuit board on my jbl pb12 subwoofer.

Sorry to hear that. The JBL PB12 are notorious for their amplifier module giving out. This item is not repairable nor is there a replacement (The module is potted into an aluminum heat sink). Actually, I need to clarify, as the late models used discrete components. If this is the case, either Repair it yourself (Google search PB12 Repairs) or take it to the local repair shop. (Or to a technical college with an electronics program, they may work on it!)

The best method is looking for a plate amp to replace the PB12 Amplifier - try the bash 300W. Several people have done this conversion. Be warned, you will need to do woodworking if you want to mount the plate amp on the box!

Posted on Mar 02, 2010

Testimonial: "thanks alot! not what i wanted to hear but helpful none the less!"

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