i have (2) rockford fosgate HE RFP3412 12" 4-ohm 400w subs in a 3/4" triangle mdf box that needs an amp...i already have a RF Punch 200.4 and a Crunch v-drive vu4.100 that powers the (4) speakers and (2) rear 8" 200w JBL subs.......i was going for either the RF Power BD500.1, Punch 500.2, or the...