Question about Altec Lansing VS4121 Speaker
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
Posted on Feb 22, 2009
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
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
Faulty input wire. Check the connections between the receiver and subwoofer. May need to clean them if dusty.
Posted on Jan 29, 2009
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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