I had my speakers on pretty loud and after a while, they just stopped working. When I turn the car stereo on or off, the speakers make a pop. They also came back on briefly one day. This gives me the impression that it is not the speakers so much as the car stereo or wiring. As the speakers still make a pop sound though, I would think that the wiring must be ok. Any idea what could be the problem? Or better yet, the solution. Thanks.