After a more than minor accident the factory 200 watt system in my 03 impala has lost it's thump.. The amp is working ,, and it doesn't sounds like any speakers are blown,,, any ideas on where to start my search of solutions?? The damage to the car included the driver side rear door (replaced) the driver side rear quarter (replaced) and the entire rear wheel/suspension on the rear driver side

have you fixed it yet? i would say to check your wiring. is it a after market stereo or a factory stereo?

Without knowing many highly specific details, my first guess might have to do with the grounds...a loose connection or a connection on anything but a solid metal surface may result in poor conductivity, resulting in less than desirable performance from your equipment.

Go to Alpine-usa.com good equipment there.