Question about KLH ASW10-120 Subwoofer

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Klh subwoofer asw80-80

Lite switch turn on causing speaker pop. is there a muting circuit problem?
can it be fixed?

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  • perky1 Mar 08, 2008

    renosean: It is a light switch, replaced all ground wires with no help. The oil burner in the kitchen is by far the worst at causing the woofers to pop and it turns them on. Added monster subwoofer unit to protect surges on elec. and cables, nothing seems to help stop this.

  • Sean Johnson
    Sean Johnson May 11, 2010

    When you say light switch are you refering to a wall switch or a lighting control switch?

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  • Master
  • 492 Answers

Unfortunatly it is due to the wiring within the house. Short of buying an apc back up which will regulate the power there is not a powerstrip that will stop this. I used to have the same problem

Posted on Mar 08, 2008

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Klh powered subwoofer model ASW10-120B... when you plug in to power... it makes a loud buzzing/humming noise


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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1 Answer

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I saw this post. I have the same problem with my 10-100.
http://www.fixya.com/support/t2753393-klh_subwoofer_about_6_yrs_old_keeps

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Did you ever find a solution for this problem? I have the exact same thing happening with my KLH subwoofer and I'd love to know how to fix it!

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1 Answer

Klh powered subwoofer keeps blowing fuses?


then the circuits took a hit and the fuse didn't do it's job in the 1st place. best is too get new circuit thats inside the sub woofer.

sorry to be the bearer of bad news

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Loud humming sound from subwoofer


just try leaving it unplugged for a while thats what i did and it fixed it

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KLH ASW10-120B subwoofer


I realize that this is an old problem, but folks are still finding it on searches, so here goes.

Here are the two pages of schematics from KLH. I wrote to their tech department and explicitly asked for permission to share them here.

Here's the lower board, which has the power supply:
KLH ASW 10-120 subwoofer schematic - lower board


Here's the upper board:

KLH ASW 10-120 subwoofer schematic - upper board


Jan 25, 2008 | KLH ASW10-120 Subwoofer

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