Question about JBL PSW-D112 Speaker

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Jbl subwoofer I have a jbl 12 inch front firing sub and it stays in the auto on mode and started a loud humming noise when sytem is not on and no signal being sent to sub. turned on and stays humming noise with a little sound. I am not sure what to check for but think it must be amplifier problem. please help and I can try

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Re: jbl subwoofer

I have an jbl acr 10 sub, which blowes the 0.62 sb fues instantly. Could it possibly be the pair of 3300uf @ 50v gone bad?

Posted on Sep 04, 2008

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Re: jbl subwoofer

There is actually some good news.  I had this problem with my PB10s (1 have 2 PB10s and 2 PB12s) It is one of 2 things, the first is that it could be a capacitor and resister combination on the amplifier board (which was the fix for our PB10 with the same problem), or 2nd, the AMP IC, which is not available for the PB12. hmmm

Posted on Oct 31, 2007

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Subwoofer makes loud hum noise

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4) bad coax to the sub.

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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.


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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The fact that you do get hum when you partially remove one of the RCA's would tend to say that the output stages are working ok. Is the hum "solid" and bassy, or distorted?

There are a few issues that these subs have had, mostly to do with capacitors in the power supply failing. If you are up to it, I can talk you through repairs to it.


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These will sound very basic, please go with it.

On your signal source, make sure you have the sub set to on.
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Check your power outlet for the sub, make sure the polarity is correct. I have found this to not always be right. Also what is on that same circuit. Things like the fridge can cause a lot of noise on the power line. Next check your connecting cables, are they of good quality? Are they running next to anything that may cause interference? Also check you connections to the signal source. Cable and dishes are known for ground problems.

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