Question about KLH ASW10-120 Subwoofer

3 Answers

Loud Buzz I recently turned on my system after being off for 2 weeks for vacation. Now the subwoofer gives off an extremely loud low buzzing sound that seems near the max volume. I only leave the sound on for a second or less. I tried disconnecting the spearker inputs and it is still there.

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  • munyaradzi Dec 19, 2007

    low buzz

  • Anonymous Jan 04, 2008

    Same problem, Hum when unit is powered up. Removed amp and found power supply board was burnt around the output resistors. Suspect power supply cap. went bad and damaged board. Were can I get a replacement board?

  • assensi Jan 31, 2008

    Very unpleasent loud noise.After I opened the back the parts are green and rustty.looks like a water got inside.Any idea where I can find the plate with thw parts to replace it?

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Yes capacitors bulged or leaking , the most important thing is to clean anyway alsways the electric print if repair with new caps because if there was leaked capacitors the dielectric fluid can damage the brass circuits on the print .
If there are allways equipments thats powered on 24 hours a day there is 1 big problem and that is the missing Self-HEaling re- forming of capacitance in the capacitor and for a to long time and if the temperature was gone the for a time and the tolerance of the cd are very tight close to the max dc. then replace them allways a 10 volt higher if the size of the elco is permitting on the place.

Posted on May 14, 2016

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  • 9 Answers

If you disconnect the signal inputs from the sub and it still makes the buzz. Then yes, it is the Caps. If you take it in to be fixed, make sure they check the resistors too. There is a reason why the caps popped. I had same problem, shop replaced caps and they blew again. Checked resistors on boards and found 6 of them to be bad.
It seems that there is a lot of buzz (sorry, could not help myself) about this sub and it being a poorly designed amp.

Posted on Mar 24, 2009

If the sound is more of a low hum than a buzz, you probably have bad capacitors in the power supply...Time to take it to a shop.

Posted on Sep 13, 2007

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I would check the caps on the power supply. They are rather large electrolytic capacitors that will look like they burst and/or leaking. When these die, the caps ground and the sub will make a loud buzzing sound. If you are handy with a soldering iron you can replace them yourself. Replace them with the same voltage or a little bigger and same with the size.

If the cap. says 16v 4700pF on it, for example, a 20v 5300pF or a 16v 6200mF cap. will work for this application.

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electronics.howstuffworks.com/how-to-stop-subwoofer-hum.htm
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