[Black09BMW]

First things first. Little noises annoy me. Today on my way home from work I noticed some static from the back of my car. The radio was at a low level not maxed out at all nor do I ever max it out. It sound like a slight crackling/ static noise and I thought maybe the rear window was just sounding funny since it's below 10 degrees here today so I turned on the rear defrost. Nothing. Then I tried using the radio controls to isolate the sound through only each of the back speakers at a time but they both sounded fine and the same. As I got home I slowly stopped the car and the noise stopped. I reversed and went forward again and the noise only happens while the car is in motion. Any help would be very appreciated. Thanks!