Ooops, guess I posted in the wrong place...sory bout that. The Tint Shop boasts that they use graphite material, is that the problem? I have been messing with the car, now the stereo plays fine, no more audio tach in the speakers, but the dynamic sound button does nothing, no boost in sound. The stereo works the same whether the button is pushed or not. So, does the premioum sound have a seperate amp that is activated with the button, or is it built in to the head unit itself? If it is seperate, where is it located? And, would you suspect that it's blown or is it fused internally?