I just installed my subs into my 02 Jetta into the Monsoon system. Sounded great until last night and today, I turn the radio on and I hear a steady thump coming from the subs, and the protect light is always on. Last night it seemed to sound ok, but today, it kept popping and disorting. The gain is only turned up about 1/4, bass boost is the same. The impedance should be 4ohms, which is what the amp is rated at.. I am at a loss here, what's the deal?