Question about JBL PB12 Subwoofer

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Celestion S8 Has a high pitched squeal with or without input signal, gets loader after warming up.

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Voltage regulator output electrolytics (220 uF/16V) heat up and start squealing/making geiger counter noise several minutes after power on. Noise stopped when electrolytics are sprayed with freeze spray. I intend to move the regs to the power amp heat sink (with heat sink greased insulators), add .1 uF tantalum caps to the regs output as close to the regs as possible and replace the 220uF/16V electrolytics with higher voltage units.

Posted on Mar 22, 2009

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Most likely there are electrolytic capacitors in the power supply and also possibly in the amp sections that are going high in ESR.

It would be best to test all the caps with an ESR meter and then replace the ones that are out of spec. You have an excellent chance that this will fix the unit.

If you are not experienced at doing electronics servicing, you can give the unit out to a service center to have it fixed.

Jerry G.

Posted on Apr 28, 2008

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How do I set up a Celestion S10 Subwoofer...


OK
Voltage is relevant to where you live in the world. America it's 110. Europe mostly 220.
What you're asking is a very deep and complicated question.
I'm attaching a link with some articles.
What I suggest is that you find an upper end audio store and ask a 20 audio head to set up your system for you. Subwoofer Setup and Calibration for Best Bass

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S8 makes a very loud vibrating buzzing noise with only the power lead plugged in


Check for ground loops. Also shut off any CFL or LED lamps inthe vicinity.

You may also have an intermittent connection on the input.

There is a lesser chance that there is an internal failure of a capacitor on the amp power supply, but it is a possibility to look at if all the wiring is in place and soundly connected. The S8 has a high gain amp. It will pick up interference from CCFL or LED ballasting supplies it will also be able to pick up other switch mode power supplies. in vicinity of the input cable.

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Dont remember which cap it is , but its 47 uf 35v, on one corner of the board. You can use a slightly bigger value and slightly higher voltage if thats all you can find. Check the two caps next to the voltage regulators, these go as well problem sorted!!!!

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http://www.usspeaker.com/homepage.htm
http://www.speakerdoctor.com/diaphragms.html
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I would check the electroltyc caps in the power supply They general are in the first part of the power supply and there will be two of them . What they do is filter out transformer hum and help stabalize the circuit. I am not saying this is absolutely the problem but the capcitors are relatively inexpensive, Easy to change. And have a habit of going bad after a couple of years in use.

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