I have a 2003 GT with facotry mach 460. Suddenly the bass from certain songs sounds horrible coming from both the pass and drivers lower door speakers. I find it hard to believe both speakers blew at the same exact time but what else could it be. Could one amp not be turned on or blown. Most songs sound fine but songs with lots of quick hard bass hits, i get there reverberation (spelling?) or vibration which basically sounds like trying to play bass on a crappy 4 dollar cardboard speaker. Any ideas?