Audio Speakers make static noise when I plug to the computer

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I just bought 2 power speakers to play with my laptop and I hear this static noise .
the weird part is the noise is gone when I unplug the laptop power cord , I can listen the music very clean when I run the laptop with the battery. I used 2 diff brand of Laptops and the results were the same .
I wonder if there is a filter or something else that can help me eliminate this noise when I plug the Laptop power cord

Thankss
 

raybay

Posts: 6,906   +10
You likely have something else in the room or on the line emitting electrical interference. The speakers are just amplifying it.
 
Thanks for the reply

Why I don't hear any noise when I plug the same speakers to my CD player ?
The noise is when I use the laptop .
 

BAW

Posts: 16   +0
Well i work will sound mixer etc. and it can be the earth which causes a buzz (solution: remove earth cable, not reccomended!) or it could just be some form of feedback!

Other than that well its got to be because of te earth, I THINK! ;)
How loud is the buzzing?
 

raybay

Posts: 6,906   +10
Long shot.
Since both are laptops...
We see this all the time.
If you are using those cheap Chinese and Korean power adapters found on eBay, they are a major cause of static and buzzing.
While the noise is occurring, unplug them to see if there is a change.
 

raybay

Posts: 6,906   +10
If the Power Adapters have an HP label on them, they are probably ok. If they have a label withpout HP on them, they could be the cause.
 
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