When I turn on the Audio System, I hear a buzzing coming from the front Passenger side speakers. (Door and Dash Tweeter.) It changes pitch slightly when accelerating. It sounds like it's connected to the electronics system of the engine or something because it changes a little when accelerating. It doesn't change in volume, it stays the same if the volume's on 1 or 30. When the Audio System's off, no noise.

Help! It's ANNOYING!