Question about JBL PB10 Subwoofer

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

Hello, I have had the JBL PB10 for several years and have had no problems. I went away on vacation and came home to a loud humming and crackling noise coming from the sub even though my receiver and all other components were powered off. The sound continues when I disconect the input coming from the reciever and does not change upon adjusting any of the dials/switches on the built-in amplifier. I also noticed that the two LED lights on the front are a mixed red and green color. Does this sub possibly have a fuse that needs replacing or is there anything I can do to test for troubleshooting? Please help! Thank you in advance.

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If you take all of the screws out of the panel where the inputs are you can get to the fuse. It is just above the power supply.

Posted on Jun 25, 2008

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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.

Posted on Jul 26, 2007

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JBL PB10 subwoofer sounds distorted and lights on the front flash


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There is a standby indication that activates after 10-15 minutes without any input signal. I suspect that might be what the red light is telling you - no signal.

Loud hum from a loosened cable is normal as hum usually means there's an ungrounded connection somewhere acting as an antenna and the amp is doing its job to amplify what it thinks is a signal, in this case 60hz stray ac current is being sensed nearby. It's a good sign that you get hum from the sub because that means the amp is alive.

Avoid manipulating cable connections with the Sub or Receiver turned on as you could introduce a static spike that could harm any connected equipment.

Are you certain a bass signal is making it into the sub? The complexities of modern AV receivers vary in how you configure them to direct LFE to a sub. Bone up on that end of the chain.

Or, just hang a CD player on the Inputs of the sub and play something with a reassonable amount of Low Frequencies.

>>>> Be advised that this way of testing has NO VOLUME CONTROL because amps without volume controls always operate at maximum gain, relying on your external controls to attentuate it (hence, the loud hum from a loose cable); so choose a track that eases into the loud parts with some quiet parts up front and BE READY TO PAUSE THE PROGRAM AT ANY SIGNS OF STRESS. <<<<

A living sub will produce only muffled rumble in the absence of other speakers producing the higher frequencies which carry the intelligence of the signal. If that works, back to the receiver for settings. If not... sigh.

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For hum problems, even those you cause yourself:

Disconnect all inputs to see if that helps. If it goes away start with the signal cables and add in things until it comes back.

Sometimes the reversing the orientation of the AC plug can help with hum. Or it could be something like a loose or high resistance connection internal to the sub. Good luck.

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