Question about KLH ASW10-120 Subwoofer

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Info Hello, Do you have any schematics for this unit?

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I wrote to KLH and they sent me the schematics for the upper and lower boards. I asked if I could share them, and they gave me permission to post them for use here.

Have fun!

KLH ASW 10-120 subwoofer schematic - lower board

KLH ASW 10-120 subwoofer schematic - upper board

Posted on Jun 15, 2009

  • 3 more comments 
  • Rob C Jun 15, 2009

    Hmm, the second link doesn't look quite right.

    Try this one instead:
    KLH ASW 10-120 subwoofer schematic - upper board

  • Rob C Jun 15, 2009

    *banging my head on the keyboard*

    Ok, try THIS one for the upper board:

    KLH ASW 10-120 subwoofer schematic - upper board

  • pdeluca5
    pdeluca5 Jul 14, 2013

    Thanks for the schematics. I am trying to figure out why the LED in the back won't power on (red or green.) I've cracked open the case and checked the fuses visible on the boards and they are ok. Any ideas?

  • Rob C Jul 15, 2013

    If you're up for it, the next step would be to start testing voltages on the board when it's plugged in. The transformer input should be line voltage (115VAC) and the output should be 28.5VAC.

  • Rob C Jul 15, 2013

    If you aren't experienced working with line voltages (plenty of power to kill you) then you should not try to troubleshoot this one any futher.


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After acquiring a fried KLH ASW10-120, I write to the tech folks at KLH and they sent me the upper and lower board schematics. I asked if I could publish them online, and explicitly asked if I could share them on, and they gave me permission to do just that.

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

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