The buzz starts in the speaker after about 15 minutes use of the speakers. The buzz is very annnoying, it gets louder as time goes on and it screws up the Bass coming from it. It almost sounds like a loose screw just to give you an idea of what it sounds like. It should not be overheating because it's not hot in my room and the back of the Sub is not too hot, it's warm just like my friends and he doesn't have this problem. I'm wondering if I should just exchange this set for a new one?