Hi, a guy I worked with gave me a pair of Sony Xplod XS-GTX120LW 4ohm svc when he left the state. I can't seem to find specs on the sub for air space but similar sony's like 1.13 cf ported. I'm looking at getting a RF Rockford Fosgate R500-1D Prime 500 Watt Mono D-class Amplifer which should...