Question about Audio Players & Recorders

2 Answers

JBL Powerbass PB12 When left on, will make very loud sound

JBL Powerbass PB12 When left on, will suddenly make a very loud ''pop''.There is a hum while running also. It does work, but makes these largepoping sounds on a regular basis. 6 to 8 yr old equipment. Can this befixed? (without spending more than it is worth) This is a powered12'' downfiring subwoofer in a home audio system. Tom

Posted by on


2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert who has written 50 answers of more than 400 characters.


    An expert whose answer got voted for 20 times.

  • Expert
  • 133 Answers

Before you spend a lot of money, try checking for these:

- poorly soldered or partially desoldered wires, connectors (power, signal input) or ANY other components (especially the ones that tend to heat up, like power transistors or voltage regulators - a component which has been heating up will cause the curcuit board around it to become somewhat darker)

- dirty or oxydized contacts on ANY of the connectors or switches

- partially or fully blown electrolytic capacitors (see if any are damaged, bulged or blown at the top, these surely need to be replaced)

- internally damaged tantalum electrolytic capacitors (probably there will be no apparent damage to these, but they may cause intermittent disturbances if they are bad).

It may as well be something else, but if your equipment was being used extensively during these 6-8 years, it is likely that some capacitors may have dried up or otherwise failed.

It is also likely that the sound vibrations caused loose connections or bad solder contacts on the circuit board since it is a powered sub with an integrated amp (many audio devices get to suffer from bad solder contacts just by heating up with years of use and even without being exposed to powerful sound vibrations).

I hope you can get it to work well again.


3rq8 (Triarcuate)

Posted on Sep 07, 2009

Testimonial: "Thanks! I wish I had your knowledge. I will take a close look,check everything you mentioned the best I can, and see if I want to repair or replace"

  • Level 1:

    An expert who has achieved level 1.


    An expert that got 5 achievements.

    New Friend:

    An expert that has 1 follower.


    An expert who has answered 20 questions.

  • Contributor
  • 60 Answers

If you have a pb10 or pb12 and it is not blowing the fuse - then it can be repaired - if it is blowing the fuse and has the ami module then sadly it is a paper weight - please contact us Edwards Electronics - Ebay - We repair amps - sell parts for them etc. and provide technical help. Thanks.

Posted on Jan 02, 2012


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

JBL PB12 will have loud thump or pop!

First try to find the source of your problem. The easiest way would be to try your sub with a different audio source to see if the problem still occurs but is sounds more like there's a problem with the receiver.

Oct 18, 2012 | JBL PB12 Subwoofer

1 Answer

On/off switch is broken off. on jul PowerBass PB12 anyone have any idea on how i can fix this? everything works fine except if on at certain loudness it will shut off if I'm not holding the switch in...

If you are somewhat technical and can attach wires to the switch - we can list one in our store - contact us Edwards Electronics - Ebay - Thanks.

Oct 20, 2011 | JBL PB12 Subwoofer

1 Answer

I have a JBL PB12 sub, no power - prev wrenching sound on startup

these a internal power control board defective, send to repair

Jan 17, 2010 | JBL PB12 Subwoofer

1 Answer

My JBL PowerBass PB12 makes a continued loud sound when it is on

Have you tried turning the gain down before turning it on. If that works, it might be the internal amp picking up noise somewhere. Maybe even a bad ground. Either way there are only a few things you can try before complaining to the manufacturer or replacing it. Changing its location might help and if it does might indicate RF interference. You can also try running it through a power strip, one equipped with a filter (these are fairly common). Good luck

Mar 29, 2009 | JBL PB12 Subwoofer

2 Answers

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

Sep 10, 2007 | JBL PSW-D112 Speaker

1 Answer

No sound what so ever

it died and the parts aren't available, same problem here, even took it to an authorized outlet, parts aren't available

Jan 29, 2007 | JBL PB12 Subwoofer

Not finding what you are looking for?
Audio Players & Recorders Logo

Related Topics:

547 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audio Players & Recorders Experts


Level 3 Expert

102366 Answers


Level 3 Expert

5126 Answers

The Knight
The Knight

Level 3 Expert

74251 Answers

Are you an Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides