I still have the original factory(Bose) system in the car. Once in a while, i would hear a buzzing sound coming from my speakers when playing CD's. It doesn't happen all the time but it occassionally sounds. what causes this?

 

Could it be on your CD? Have you tried any other CDs? Does it happen then? Does it happen when you have your radio on?

 

How about your cell phone? When I charge mine, i keep it under the coin tray. My Radio buzzes when ever i get an incoming call or text message.

 

plus cellphones "check in" every couple min, ifyou put your phone by your speakers you'll hear a lil' pop in thespeakers every min or so.