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Whine in home audio

Tags:
  • Speakers
  • Audio
Last response: in Home Audio
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November 28, 2012 6:18:58 AM

Hello,I have cheap & old theatre system I use in my
garage the main unit has 10" sub built-in & 5 small speakers with multiple device input options.
Plugged in to 110 & no speakers hooked up and no audio inputs plugged into it there is a whine heard either through woofer or something internal. I have a very long background in automotive electronics and onboard diagnostic systems, I can fix or identify
almost any problem in 12 V systems, but know nothing about the internal workings of audio equipment & what causes
them to produce unwanted noises, can someone help, it gets worse the longer it's plugged into the wall outlet doesn't
matter what outlet or where

More about : whine home audio

November 29, 2012 6:11:10 PM

Unless the unit doesn't like to be on with no source connected (unlikely) I would guess that the sub amp is oscillating. Connect the other speakers and if you can hear the same thing through them them then maybe there is a power supply problem. You could take a shot at repairing it but it doesn't sound like an expensive unit and give the age it might make more sense to replace it.
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December 1, 2012 1:17:07 AM

Thanks for your reply, I figured it was gonna be a throw it away thing to get rid of the noise,
but thought I would ask someone if there was an easy cheap fix that I didn't know about.
Thanks again
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