Here's the thing, i was considering getting 2 - 12" older model p3s, 2ohm subwoofers, Power Handling (Watts RMS): 400 Watts RMS 800 Watts Max With this amp http://www.rockfordfosgate.com/products/details/p1000x2 Rated Power (RMS Continuous Power): 300 Watts x 2 @ 4-Ohm 500 Watts x 2 @ 2-Ohm wired with the 2ohm version If i can't find the older ones in 2ohm, i've come across the 4ohms, but wiring them would only deliver 300 watts, is this enough or do i have to get the 10"(which only require 300)? going in the trunk of a car, have 39" width and want to do less than 8" deep, ~16-18 high(considering leaving a spot on the box for the amp). will post up a drawing later(i have a couple tasks i need to take care of when i get home)