My subwoofer has a bass problem, idk what's wrong with it, the bass starts good at first but then it keeps doing weird sounfsds: here's a video: http://m.youtube.com/watch?v=JTZ9ShUrcMo And here is a picture of the system: http://i60.tinypic.com/sy9y5e.jpg The problem is whenever I turn up the bass, it keeps going BRRRRR like in the video. How do I fix that? It used to work perfectly before.