Question about KLH ASW12-200 Subwoofer

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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

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  • MikeSch Mar 22, 2008

    My KLH ASW12-200 subwoofer doesn't woof anymore - How do I figure out what's wrong - I've tested all the cables and they're fine - the power light comes on but no sound comes out. Any suggestions?

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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

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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

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Without knowing what they're hooked up too.. SOUNDS like your uder powering them, OR over powering them. Look at the back of the speakers the wattage is what your looking for, look at your amp, example: 1000w speaker running on 50w amp = not good.

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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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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.

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I have a KLH ASW12-200B subwoofer and when plugged in and turned on the light is on but no sound comes out. how do i know if the amp is bad?


How do we knwo it has a good input? The problem could be higher up the food chain. Plug a known good audio source into it. Any Line Level source will do.

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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.
http://www.fixya.com/support/t2753393-klh_subwoofer_about_6_yrs_old_keeps

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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.

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Powers on but no sound! what's the problem?


Try making sure that your drivers are all up-to-date, make sure your connection is plugged into the correct jack (usually green one for sound)
BTW is this for TV or PC?? also what windows system if its a pc?

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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


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Loud humming buzzing sound coming from subwoofer


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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....

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