Question about JBL PB10 Subwoofer

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Jbl 12 subwoofer

I have a jbl front firing subwoofer about 7 years old and just starting loud humming sound when plugged in and in the auto on mode. tried sending music singnal and still half sound mostly noise. seams like amplifier problem just not sure what to check for. I can take it apart and solder or replace or check whatever.any help I would greatly appreciate. thanks.tc.

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Winslow is correct. It is likely to be a bad capacitor on the power supply. There should be two large capacitors on the power supply circuit. These capacitors filter the 60Hz waveform from the power. These will be the two largest capacitors in the entire system. The bad capacitor is probably bulging. For safety, you should replace both capacitors with exactly the same uF, voltage, and temperature ratings. Don't use anything smaller than the ratings of the current capacitors. And don't waste your time going to RadioShack, they won't have any big enough capacitors. It would also be a good idea to check any resistors that are near the capacitors, if you see a slightly larger resistor that is burnt, then you will probably want to replace it.

Posted on Jul 01, 2008

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Buy a replacement "plate amp" from parts express (google it). I replaced mine and it was a vast improvement.  I think I bought the 100 or 150 watt one but bigger will yield better results.  If the jbl is the model bp12 it is a killer sub with a flawed amp.  Point being it IS worth changing the plate amp.  Changing the plate amp will require a bit of carpentry with a jigsaw to enlarge the mounting opening on the back.  Remove the speaker while doing this.  Also wouldn't hurt to upgrade the speaker wire between amp and driver to monster cable or equal.

Posted on Mar 13, 2008

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Good chance it's the power supply; a capacitor there, the large one, may have gone. These things age and when they go, there's noisy power to the amp circuit and ... well, that may be what you're hearing. You should check your audio wiring, too. That woofer could be picking up a 60Hz hum from the AC mains and amplifying it. Maybe you can try another spkr on same cables and see if hum is in your woofer or elsewhere. Good luck.

Posted on Sep 11, 2007

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1 Answer

My JBL subwoofer just buzzes when I turn it on. It doesnt seem to change anything if I plug it into a powerstrip or the wall. It also doesnt seem to matter what setting it is on, all that changes is the...


It is possible that the amplifier within the unit is faulty; The best you can do is to put the woofer ON for about 12 hours so that if there is any chance of any capacitors being faulty or has electrlytic drying.
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