Question about Altec Lansing VS4121 Speaker

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Subwoofer making load humming noise - Altec Lansing VS4121 Speaker

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The reason for the hum in the Altec Lansing VS4121 speaker system is the stray field of the power supply transformer. This stray field is strong enough to affect the amplifier. All other reasons given by numerous reports on the web do not apply. If you are handy and have got the time you may mitigate the problem by physically moving the amp away from the power supply or turning it 90 degrees. I managed to lift up the amp in my subwoofer by about 50 mm, which was difficult to achieve and did not cure the problem perfectly. I don't see any other way to solve this problem except you feed DC in from the outside and do not use the internal power supply. That would be really odd indeed

Gerhard Weber.

Posted on Feb 22, 2009

  • na15 Jan 31, 2011

    I attempted to move this also. Decided it was too much of a pain to be worth it. For what its worth I have an old set of Altecs from about 8 years ago and they do the exact same thing. Hum drives me crazy. I should have learned the first time. From now on I will not buy cheap Altecs. Its too bad they could not address this issue because the sound system itself sounds great for the money.

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Altec Lansing says in the manual that the hum on the 4121 is "normal". The gall.
Im not sure but maybe if you could convert your unit to accept DC instead of AC, it might go away. Its a long shot though.

Posted on Jan 31, 2009

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Subwoofer making humming noise if you adjust volume control up, but if you turn off and turn on again it is ok temporary but later on it humming noise again.

But also if volume control was not so high subwoofer was ok.

Posted on Feb 19, 2009

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Faulty input wire. Check the connections between the receiver and subwoofer. May need to clean them if dusty.

Posted on Jan 29, 2009

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I THINK YOU SHOULD UPDATE YOUR OS TO WINDOWS 7 SOME OF THE SETTING S ARE THERE TO CONTROL THE HUMMING SOUND

Posted on Dec 31, 2010

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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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4 possibilities:
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2) close proximity to a CFL, or other flourescent fixture.
3) bad filter caps in the sub.
4) bad coax to the sub.

in any event, check wire routing. You can also track down the noise sources by using a portable AM radio tuned off station. it will pick all manner of RF noise around the house. Light dimmers are notorius noise makers.

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Hello
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hardrocko

Thanks for using FixYa

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