Question about JBL PB10 Subwoofer

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Sleep mode I have a PB10 subwoofer that keeps going into sleep mode. I try the test tones and the subwoofer comes back on, but for use with everything else, the subwoofer powers down. I've checked the cables and I know I have power going to the subwoofer. If you have any suggestions, I would love to hear them. Thank you.

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It will power off if the frequency range of the signal being sent to it is set too low, or the amplitude of the signal is too low as well.

Try increasing the subwoofer crossover frequency and/or increase the gain from the LFE/SUB of the receiver/preamp you have it connected to. Also make sure that in the setup menus of ALL of your components have an LFE channel enabled such as by selecting the output of source material of your DVD player for example, to output 5.1. Otherwise, it will not send a signal for the subwoofer to play, nor will it play the signal if the crossover frequency is set too low.

Example; the setting on your DVD player setup menu is set to two channel: result with only one exception, subwoofer will not play

Example; subwoofer/LFE level on receiver/preamp set to -10dB and/or subwoofer volume too low. Result: subwoofer will not play.

Example; subwoofer crossover point set at 35Hz. Source material playing sound at 30Hz and lower. Result: subwoofer will not play.

Posted on Oct 30, 2010

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2 Answers

My pb10 subwoofer will turn on when it gets a signal but won't stay on. It just constantly flashes on and off to the beat and the sound is distorted.


2 possible causes. The power supply is failing, bad or leaky caps. Or, the cap for the timing delay on the 'turn on' circuit is bad and now there is no time delay...

Can you switch to constantly on as a test?

Mar 23, 2010 | JBL PB10 Subwoofer

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JBL PB10 subwoofer sounds distorted and lights on the front flash


More likely to be the Class D power amp module, but you should look through the service manual to make sure all the parts are installed correctly. My PB10 AMP module went out and you cannot get one anymore.
http://manuals.harman.com/JBL/HOM/Service%20Manual/PB10%20sm.pdf

Nov 10, 2009 | JBL PB10 Subwoofer

2 Answers

Jbl pb10 subwoofer will not come on, that is the two lights in the front will not come even though it is plugged-in


1/ Check the power outlet, dont laugh i have been caught by this one
2/ Is the power cord removable (2 or 3 pin) if so then try another cord.
3/ If not check to see if there is a power switch in the vicinity of the cord
I know it sounds stupid however it does happen.
4/ Check to see if there is a fuse in the same area.
5/ If not you will have to remove the cover back, front, or bottom
to gain acess to the internal power supply, there should be a fuse in
the power supply and or a fuse in the amplifier circuit and or the speaker line.
binary6

Sep 16, 2009 | JBL PB10 Subwoofer

1 Answer

JBL PB10 subwoofer, it makes a loud burp noise when it comes on.


In the industry - It is called "Turn-On Thump".

There are some manufacturers that eliminate components like noise filters on enry level lines to save money.

There is no way to lessen this noise without ripping the amplifier apart and having a technical knowledge of the way amplifiers work. It would involve hard-wiring a slow charge capacitor in the turn on line so it gradually builds power instead of getting it all at once.

Thanks for using FixYa - a FixYa rating is appreciated!!

Feb 10, 2009 | JBL PB10 Subwoofer

1 Answer

Thump at the time of shutoff


The amplifier in the sub as with any other amplifier has a capacitor in it. Essentially a battery that holds a charge. When you trun things off such as subs or amps with a powerstrip instead of the intended on off button, the power supply has been cut, but the capacitor is still energizing the unit. So it catches the noise in the line.

Mar 07, 2008 | JBL PB10 Subwoofer

2 Answers

PB10 Loud Hum and Crackle- LED Lights mixed Red/Green


Hello, Jesse. I doubt I can help, but there is at least one SIMPLE thing you can try - with maybe a 10% chance it wil return your unit to normal: Unplug the unit for 30 seconds, then plug it back in to a DIFFERENT outlet. Oh, yes - there are NO fuses or other "reset" devices. I'm sorry I couldn't offer you more help.

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