Probably a little late for ya, but for future posters...

It didn't take me long to ditch the rear speakers, even in the two RCSB's I owned. Each time I've run 5 1/4 component sets in the doors and 6-6 1/2 components in the front kick panels. You'd be surprised how clean and loud you can get that setup tuned to. I currently have 4 8"s in a downfire box too. She pounds and sounds clean as could be.