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Klh s100ETH subwoofer produces no sound - Audio Players & Recorders

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  • hudgarden1 Nov 07, 2008

    When I plug it in, there is a thump form the subwoofer. shortly after it is plugged in there is some vibration from the subwoofer when you turn the gain and frequency knobs, but this goes away very soon. nothing looks or smells burnt. I have an analog multi tester, but not much knowledge on it's operation.

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SOURCE: Surround sound system is not producing sound through the subwoofe

Several things could cause this, to make sure the sub woofer is working at all disconnect the cable from the back of the receiver. You should hear some sort of output from the subwoofer when you handle the plug. IF so replace the plud and go into your settings menu (press the A and B button at the same time) and go through the speaker set up. It may be that the receiver has not retained the memory that there is a sub woofer connected.

I hope this helps.

Posted on Feb 27, 2009

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4 Answers

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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Jan 05, 2016 | Audio Players & Recorders

2 Answers

Trying to hook up a KLH sub woofer, S100ETH, PSW8-100 to a VCR reciever. Reciever has sub woofer connection but does not works on the KLH sub woofer. What is the problem ?


I suggest you go over your receiver set-up instructions. See if you need to set the receiver to acknolwedge the addition of the subwoofer. It should be in your receiver set-up steps. Just as a check, hook up one of your other speakers to the subwoofer lead to see if gets audio signal. I'm guessing the issue is your receiver settings.

Jan 06, 2015 | KLH Audio Players & Recorders

1 Answer

Klh s120eth subwoofer not producing sound.


Normaly C26 has turned bad. It's 22uF/25V and is easy to access when module is disassembled.

Dec 29, 2012 | KLH Audio Players & Recorders

1 Answer

KLH ASW8-100b Sub woofer. I need to know how to hook it up to my surround sound


Some specific model numbers might lead us to specific manuals and specific instructions.

Depends on your source and its amplifer complement. Some can drive a subwoofer directly while others just produce a Line Level subwoofer output for use by a separate amp feeding a subwoofer or self-amplified sub.

The set-up of the source to produce a subwoofer output is totally dependent on its design. Generally, you have to 1) tell it you have a sub, 2) define how bass will be routed or shared among your various speakers accordingto their bass-handling capacities, 3) using test tones, set the relative ludness and crossover settings so you have a uniform sound field.


To find a manual, maybe run it by the manufacturer

Mar 17, 2011 | KLH ASW8100 Subwoofer

1 Answer

Klh subwoofer asw12 200 powers on but no sound, hooked up my other sub works fine


There's an amp inside the unit, most likely the semicondutor that does all the work has failed in it.

Jan 29, 2010 | KLH ASW12-120 Subwoofer

1 Answer

KLH ASW10-120 Subwoofer My KLH ASW10-120


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!

Dec 26, 2009 | KLH ASW10-120 Subwoofer

2 Answers

No sound and smells like burning


There are a lot of folks who've had power supply issues with this sub. Typically, the large resistors fail, which takes out the capacitors.

If you know how to read schematics and replace parts, then these might be helpful to you:

Here are the two pages of schematics from KLH. I wrote to their techdepartment 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


Nov 08, 2009 | KLH ASW10-120 Subwoofer

1 Answer

Loud humming sound from subwoofer


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

Sep 21, 2008 | KLH PSW8100-8 Subwoofer

2 Answers

Subwoofer no longer produce base sound


Master witch is blown. Also the frequency control swithe is probably gone. No replacement parts available. contact KLH at 818-767-2843

Dec 03, 2006 | KLH ASW12-200 Subwoofer

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