For the longest time now, the rear speakers in my girlfriend's 3G Eclipse have been acting up. Out of nowhere they will start to make thumping noises, like they are getting some kind of bass signal. I'm not sure if the speakers themselves are shot or if the wiring is shorting out somehow. There doesn't seem to be any certain time that it happens. It's pretty much random. You'll still be able to hear whatever music is playing, just that there will be some added thumping noises. I don't know what to make of it. The speakers are stock, but I don't want to replace them if they don't need to be. Any way to test them or the wiring?