Question about JBL PB12 Subwoofer

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"Dhoom" sound from subwoofer

My subwoofer used to work perfectly, but after I unplugged the power once without turning the unit off, it stopped working. Even after giving the LFE input from my Harmon Kardon receiver, the light remains red. Plus, it makes loud "Dhoom" sounds intermittently when power is on.

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  • burn_junk Nov 15, 2008

    I have the exact same Issue with mine. Did you find a repair, circuit schematics or parts list??

  • glroberts84 Jan 20, 2009

    Any solutions to this problem? I have the same one...

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5 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: Infinity PS-12 Subwoofer clicking in and out of standby

I've got the same problem with my PS-10 from Infinity. It works great for about 30-45 minutes, then click in and out of standby mode. It sounds to me like a overheating safety fault. When I take off the amp panel (unplugged), it feels quite warm, and you can see that there is really no way for heat the escape. I tried running it briefly with the amp panel outside and it seemed to work fine! Since I'm out of warranty, I think I'll try cutting some ventilation holes. I noted there are 2 oval shaped holes near the bottom (just above amp), but covered with the panel sticker. I'll try cutting those open first.

Posted on Dec 19, 2009

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SOURCE: JBL Subwoofer - Intermittent operation

Sometimes bad caps show a lifting or rounding of the top of the cap, sometimes this top will split from heat and pressure and sometimes it will not show any sign of damage but will be dry inside and its capacitance value will drop to a very low value. Replace the big power supply caps and test again. Get the same size, value and voltage rating. You can go higher on voltage rating and a bit on value. Getting a similar size or something that will fit in the same space is important also.

Posted on Mar 24, 2010

  • 14 Answers

SOURCE: The subwoofer stops working and makes a loud flat

One year waranty period from JBL on the electronics.

To find the authorized JBL service center in your area:


  • Go to: www.jbl.com
  • Click on United States
  • Click on Support at the top
  • Click on Find My Product
  • Enter your Model Number or Select your Product from the drop down list; then SUBMIT or SEARCH
  • On the list on the left side, click on Service Center
  • Supply your zip code at the next screen, then FIND
  • A list of service centers in your area will come up.

Posted on Nov 23, 2010

SOURCE: I have a JBL venue sub10 subwoofer. I noticed a

Hi well i would think that perhaps a capacitor in a cross-over network may have failed? What top do is open up the speakers and locate the capacitor, and inductor, cross-over network, that's the part that splits the frequencies to each speaker, hi, mid, bass, and simply replace the capacitor "On Spec" as it were, this or simply replace the entire cross-over network? this may help. It's worth a shot anyway? It also may simply be a bad speaker? again replace "on spec".I don't think from what you describe that you have "Overlooked" anything at all, it's just bad luck.
"on spec' simply means to replace without thinking about it....

Posted on Sep 26, 2011

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