Speakers make static noise when I plug to the computer

[CASANAJ]

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]

You likely have something else in the room or on the line emitting electrical interference. The speakers are just amplifying it.

 

[CASANAJ]

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]

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]

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.

 

[CASANAJ]

Boths Laptos are HP and the Power Supply was made in China
Input 100-240V 1.6A 50-60HZ
Output 18.5V (18.5V) 3.5A

 

[CASANAJ]

I have to play the music loud to avoid the buzz
Where is the earth cable on the laptop ?

 

[raybay]

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.