Question about JBL PB12 Subwoofer

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Power board in JBL PB12

My power board in my jbl pb12 subwoofer is done. can i order a new one and replace it myself?

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5 Suggested Answers

ice man
  • 68 Answers

SOURCE: jbl pb12 subwoofer

yes it can be repaired. but i need more details on this...

Posted on Apr 23, 2007

SOURCE: jbl subwoofer PB12

replace c42 100uf 16v capacitor

Posted on Apr 12, 2008

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

  • 1121 Answers

SOURCE: I have a JBL PB12 sub, no power - prev wrenching sound on startup

these a internal power control board defective, send to repair

Posted on Jan 17, 2010

  • 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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1 Answer

I blew the circuit board on my jbl pb12 subwoofer. how or where do i find a replacement and is it expensive or a cheap part to fix/replace?


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!

Mar 01, 2010 | JBL PB12 Subwoofer

1 Answer

Subwoofer will not power up


More likely to have shorted out Class D amplifier module that was badly designed.
Here are the service manuals:
http://manuals.harman.com/JBL/HOM/Service%20Manual/PB10%20sm.pdf

http://manuals.harman.com/JBL/HOM/Service%20Manual/PB12%20sm.pdf

I modified my using Linear Amp IC from TI, bot the same power but loud enough for me. http://s807.photobucket.com/albums/yy352/budm/JBL%20PB-12%20mod/

Jan 17, 2010 | JBL PB12 Subwoofer

1 Answer

I have a JBL PB12 sub, no power - prev wrenching sound on startup


these a internal power control board defective, send to repair

Jan 17, 2010 | JBL PB12 Subwoofer

1 Answer

Jbl PB12 powered sub woofer


if your serial number starts with ha then it's probably a bad capacitor C72 . 6.8uf 100v np electrolytic. replace it with a higher voltage capacitor of the same value.

Mar 10, 2007 | JBL PB12 Subwoofer

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