I posted this is my car thread too:

Ohhhh I see now. I'm going to probably end up with 3 amps when I'm done, this is starting ta get complicado amigo. I will need some help, so bare with me. Should I power the amps all off of one 1/0 wire from the battery? My hu has three pre amp outputs, one for front, one for rear, and one for sub, will i need 3 sets of rca's to run from the hu to the trunk? I think it would be easiest to have all amps in the trunk, for power reasons.

This is completely new to me.. so please help!!