How can I remove the background sound from the headphone jack for my MacBoo

for my MacBook Air problem adding music intensifier (Panasonic ST-HT1000) to give it an unpleasant sound background that sounds like a whiz, it's not so loud, but it is an unpleasant .. after a short time can get used to, but the fizz does not pass, however, believe that it is a big problem.
Further I notice that when MacBookAir disconnected from the charger, it remains quieter sound.
At first thought that the headphone jack (3.5 mm Headphone:
Connection: 1/8-Inch Jack) or wiere have problem, but tried 3 different cables, but that does change enything, the problem remains.
When I added iPhonu3GS playing - the background sound were not, then everything is OK!
How can I remove the background sound from the headphone jack for my MacBook Air 13?

There is no way to bring that up unless you have it typed in a document. You can use My Support Profile to find a list of serial numbers that have been purchased or registered with your Apple ID.
http://support.apple.com/kb/HT2526?viewlocale=en_US 
17" 2.2GHz i7 Quad-Core MacBook Pro  8G RAM  750G HD  240G Vertex 3 SSD Boot HD 

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