Question about KLH ASW12-200 Subwoofer

2 Answers

Subwoofer no longer produce base sound

Please help. When plugged in the power cord, I saw green light on, but my KLH subwoofer has no base sound, just regular sound. I tested the speaker unit (the cone) and it is in good working condition. How to test the amp unit in the back to see what's wrong ? I did open it and touch the big black block and assume it should be warm with power on, but it wasn't. Could it be blowned ? and is ot easy to change it? Thanks in advance. Keivin

Posted by on

2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer
Re: Subwoofer no longer produce base sound

I dont get bas anymore. i hook up and get a hum type of noise. when i hook up at speaker level. it works, but it contains vice also.

Posted on Oct 15, 2008

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer
Re: 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

Posted on Jun 15, 2008

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

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.




Jan 05, 2016 | Speakers & Subwoofers

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 Speakers & Subwoofers

1 Answer

KLH ASW8 Powered subwoofer keeps blowing 3A-250V fuses

The transistors at the output stage of the sub amplifier circuit might be shorted so each time you power on, the circuit draws a very high amount of current which causes the fuse to blow. It's definitely a problem with the circuit so using a higher current rated fuse would probably just result in damaging the amp even more. You should ask a qualified electronics technician to take a look at it. I hope you can fix it.

Oct 17, 2012 | KLH ASW8100 Subwoofer

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

My model 765S KLH powered subwoofer keeps blowing fuses (2 amp). Is it fixable and is it worth fixing?

I saw this post. I have the same problem with my 10-100.

Nov 13, 2010 | KLH ASW10-120 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

1 Answer

Loud hHum from Subwoofer

Sounds like the hum might be mains hum caused by the failure of the power supply capacitor(s) in the sub. It/they will be the largest on the pc board. You will find all the details (needed to replace it) on them. If you find more than one replace both.

Dec 10, 2009 | Speakers & Subwoofers

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

3 Answers

Loud humming buzzing sound coming from subwoofer

make sure you have the speaker connection right if you do then it is a ground problem try plugging it in a different outlet

Dec 16, 2008 | KLH HTA-4906 System

2 Answers

Lost instructions

The 'Subwoofer' output on your receiver is used to connect to a powered subwoofer with a built in amplifier. Your KLH speakers use what is called a 'passive' subwoofer, it gets its power from the receiver and then passes the higher frequencies to the left and right front speakers after taking out the low frequencies for the subwoofer. A speaker system with a passive subwoofer is good for casual listening, but a powered subwoofer is required for really hearing low frequencies and rumble in movies. The KLH speakers you have were highly rated in their time for their price. The four satellite speakers and center channel speaker have very good sound compared to the little 'midget' surround sound speakers most people buy today.

Here's how you hook them up:

- The left and right front channels from your receiver terminals should go to the terminals on the subwoofer marked 'From Amplifier'
- Your left and right front speakers are then connected to the subwoofer terminals marked 'To Speakers', they do not connect directly to your receiver.
- Your center speaker is connected to your receiver terminals marked 'Center'
- Your rear speakers are connected to your receiver terminals marked 'Surround'

That should get you up and running. If the bass isn't good enough with the passive subwoofer, you can get a decent powered subwoofer like the Velodyne VX-10 for about $150 and 'kick it up a notch'. Good luck and enjoy....

Jan 07, 2008 | KLH HT-9900 System

Not finding what you are looking for?
KLH ASW12-200 Subwoofer Logo

Related Topics:

508 people viewed this question

Ask a Question

Usually answered in minutes!

Top KLH Speakers & Subwoofers Experts


Level 3 Expert

4518 Answers

Electro Med Services...
Electro Med Services...

Level 3 Expert

5327 Answers


Level 3 Expert

3287 Answers

Are you a KLH Speaker and Subwoofer Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides