Right now, with my old Carver 200 watt amp, I have the gain on the amp as low as it will go and the head control set at minus 4. And when I crank it, the mirrors shake. My only problem is the alternater whine at idle, and the lack of volume from the factory amp. I have new wires to run for all of the speakers-I just have to decide on going to the front for the head amp or the back for a separate one. I was told that my head unit will be powerful enough-it is 60 W per channel, and MOSFET for good qualilty. BUT if I wire the front and then dont like it, I will not be happy redoing everything to the back. So I just keep putting off doing it