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Discuss Eliminating subwoofer hum/buzz in the Home Media Centre Forum area at ElectriciansForums.net

kropaske

Regular EF Member
@Midwest
Tech support come back today but not much of a help, basically try to plug it in somewhere else to double check and if still buzzing take it back.

Also did not post on the forum from the link but did read lots of post there about same problem and tried few solutions but din not get anywhere.

@mattg4321

Seems like excacly same issue.
Did you try to connect it to isolated transformer or some power conditioner or even shaver for testing purpose?


I may try to link the casing of the amp and sub, in my case is all build in so won't see any cables.

What's bothering me is that this is second unit (first one was from Amazon and did excacly the same thing) and this one was plug in in the store and I could not hear anything. On the other hand they may have all equipment connected through some kind of power conditioner.
 

mattg4321

Electrician's Arms
The last one I had that did this was about a decade ago and I'm pretty sure I returned it for a replacement and it did the same thing!

I seem to remember the humming stopped on my current sub for a few months maybe a couple of years ago, then started again.

I'm pretty sure it's something to do with earth potentials as @marconi has been alluding to. I'm not sure its a 'fault' with the sub. More that its some kind of design error that makes them do this under some circumstances i.e. supply voltage/quality differences from one place to another.
 

static zap

Regular EF Member
Human hearing is easily distracted ,
( take a sound level meter with you )
.. Shop test only needs to be a little noisier
and in a wide open space !
..could compare by taking it outside..
Power supply is some of cause ...
but it will be a bit ,dangerous + expensive to run from
batteries !
 

Midwest

Electrician's Arms
@Midwest
Tech support come back today but not much of a help, basically try to plug it in somewhere else to double check and if still buzzing take it back.

Also did not post on the forum from the link but did read lots of post there about same problem and tried few solutions but din not get anywhere.

@mattg4321

Seems like excacly same issue.
Did you try to connect it to isolated transformer or some power conditioner or even shaver for testing purpose?


I may try to link the casing of the amp and sub, in my case is all build in so won't see any cables.

What's bothering me is that this is second unit (first one was from Amazon and did excacly the same thing) and this one was plug in in the store and I could not hear anything. On the other hand they may have all equipment connected through some kind of power conditioner.
In that case (sounds like a product design problem), I'd send it back & claim a refund. Purchase from a different manufacturer.
 

AlmondSauce

Regular EF Member
If it hums when there's nothing plugged into it (aside from power), then it's almost certainly defective - or just poor quality. Ground loops from different earthing potentials are created when you're feeding unbalanced audio signals powered from one supply into a sub powered from another. If you're just plugging it in, switching it on and hearing buzz with nothing else connected, then something's wrong!
 

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