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Posted on Oct 10, 2009
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It is a klh powered subwoofer, which buzzes when plugged in, even though the power switch is set to "off"

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  • Expert 47 Answers
  • Posted on Oct 11, 2009
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Sounds like the grounds are screwed up. Try using a grounded wire for the subwoofer input. If that doesn't work, it sounds like something is internally screwed up, like the power supply doesn't fully power down. I guess besides buying a new amp, just connect it to a power strip where the switch is accesable and shut the sub off with the power supply.

  • Anonymous Mar 07, 2011

    Interesting. In the KLH Basebite II manual it says in Troubleshooting if there is a hum when the volume is increased or when you turn your reciever off you may be getting feedback. Move the Subwoofer away from the speakers or try setting the subwoofer phase switch to reverse.

    Also be sure you have it wired to the correct polarity: red or gold is usually and black or silver is -. Also if your BAssbite is connected via the speaker terminals (not the sub jack) then you want to set your recievers Subwoofer menu setting to OFF

    And as the first comment says, you might want to connect it to a switched power supply or even plug it into it's own recepticle. Something may be interfering with the power supply and by isolating it from the rest of your equipment you may just kill the buzz :-)

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  • Posted on Dec 13, 2009
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I have a KLH Bassbite II that has always had a hum when turned off. It never seems to heat up so i never really worry about it. It is strange. Off should meen off!

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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.

when-plug-in-power-makes-loud-buzzing-lgqxs5x4gp2eri5a2qchwtne-5-0.jpg

when-plug-in-power-makes-loud-buzzing-lgqxs5x4gp2eri5a2qchwtne-5-1.jpg

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tip

Schematic Diagrams for KLH ASW10-120

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 FixYa.com, 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
1helpful
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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.
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My subwoofer constantly makes a steady intermittent buzz sound while plugged in, even while powered off.

If it has a 3 prong plug, try a 3 prong adaptor - where only 2 prongs are plugged in. Sub's should not be grounded. If it still makes a hum noise, the amp circuitry may be compromised. Replace the amp with an equal at www.partsexpress.com

If you need further help, I’m available over the phone at https://www.6ya.com/expert/dan_77d17b8918f54455

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KLH subwoofer Model BASSBite V. Has a bad 60Hz buzz

Before you go throwing money at this problem, try to eliminate any external influences like track lighting. I myself am trying to figure out why mine makes a buzz throughout my system when the lights are on. I already replaced the variable light control with no improvement.

Bad cable ground can let airborne electronic noise into the Sub's amp.
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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!
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Have the KLH ASW10-120 Powered Subwoofer and it is blowing fuses

If it stays on for 3 seconds then it probally is not the transformer. However it may very well be the power amp no way to tell untill we operate. Call Pro Line Music 215-736-8055
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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
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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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