Question about KLH PSW8100-8 Subwoofer

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No function I have had this powered subwoofer for a few years and it worked well enough for a while. At some point it developed a buzz, so I disconnected it. When I went to mess with it again, it doesn't work at all. Plugging it in only with no audio connection and switching it to ON, it just makes and aweful loud buzz. I have swapped out fuzes, and pulled the thing apart completely. There aren't any visable problems with the connections.

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  • Anonymous Apr 03, 2008

    Ditto here.

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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

1 Answer

Subwoofer suddenly making buzzing sound but is not hooked up to anything,fuses arent blown and its been in the same spot for a few years and never had a problem.happened suddenly.moved it to another spot...


hi pls make sure that there isn't any other magnetic or electromagnetic device near the speakers because due to induction ur speakers magnetic field gets distorted which makes that buzzing sound irrespective of no fault wiring may be this may help u or see that the wiring near the woofers speaker magnet is attached strongly so that it doesn't distorts any more was this helpful if yes pls vote
with warm regards - bonefirediv

Mar 25, 2011 | Car Audio & Video

1 Answer

Left speaker has developed a hum. Checked connections and all seems well. Sounds raspy like the speaker has blown.


This is likely due to a problem with the amplifier. You may have turned up the amp to the point of overdriving the speaker. The distortion at these high levels cause clipping and turn what was once crisp, clear sound into a muddied, garbled mess.

If the speaker is left connected to that source long enough, damage to the speaker and the amp may occur.

Without changing positions of the speakers: You can disconnect the affect Front or Rear L & R speakers and swap them (connect the L speaker to the R output of the amp and vice-versa). If the buzzing / hum "moves" to the other speaker, then the amplifier has the problem. If the buzzing / hum stays with the same speaker, the speaker has issues and is likely "blown".

Either way, it is probably not going to be a "cheap fix"

Good luck!

Jun 24, 2010 | Boston Acoustics VRS Micro Speaker

2 Answers

Jvc sxpw650, my house was hit by lightening and now my sub makes a loud noise and the receiver which was grounded reads overload after the speakers work for a few seconds! please help? can i just replace...


The reason it goes into overload is due to the fact that the power amp section parts have developed a short and thus causing an overload in the power supply. The affected parts need replacing and I rather suspect that the subwoofer amp section has also developed a fault. I rather think with the lighting damage that you might have to replace the lot! And not just the subwoofer!! If your house was insured replacements might be covered by that. If not you sound like your in for a big bill!

Jun 22, 2010 | Audio Players & Recorders

1 Answer

Pioneer Elite vsx-27tx receiver with no bass!?


There may be a subwoofer mute function on your amp. The sub out is nothing more than a preamp output with a low frequency response. It is meant to be amplified by an external amp. Either check your powered subwoofer for operation or look through your operators manual for a sub mute function.

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1 Answer

Subwoofer problem


If you get your system up and running and hear an audible buzz or hum, the first culprit to look at is either the powered subwoofer or your reciever feed at the entry point to your system.



Dec 23, 2009 | JVC RX-6018V Receiver

1 Answer

Loud buzzing from Kef PSW1000 Subwoofer


yes. A good idea. Kill power to the sub, then unplug and remove everything from the sub. go ahead and plug it in again and check for buzzzz.
That is test one. if you have buzz still, its the sub assembly. bad luck, but not impossible. If the buzz is gone its one of the signals to the sub. They can produce a buzzz without any signal coming from your stereo equipment. Replace the feed line, enjoy! BTW...Kef sure does sound clean. good choice.

Nov 09, 2009 | KEF Audio PSW 1000 Subwoofer

1 Answer

Subwoofer Emits a Buzzing Tone


The 2200 uF capacitor in the power supply has gone bad and the humming is a 60 Hz from the rectification of AC to 18 vDC.  Either get a new power supply or take apart the power supply and replace the bad cap.

Mar 16, 2009 | Altec Lansing AVS 500 Computer Speakers

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