chesseroo's recommendation is right on! However you really didn't give some of us (at least me) enough info to go on. Does the problem occur on only one recording or many different types of music? Does it happen at different volumes - i.e. when playing louder - is the buzzing louder?
If coming equally from both speakers, it is more likely a "source" problem. (music, amp, ground, bad connection, etc). Hopefully Joe can lead you down the right path to diagnose and solve the problem.
Best of luck!
Randyman
