1999 chevy blazer 4dr.was going to do pg rsd"s in front and coax in back run off a 150x4 amp. thinking of skipping the rear doors and using a set of comps in front that i can bi-amp and run with lots of power. i have subs. which way seems best.and will back seat passengers still be able to hear,i only ride my son once in a while in back.so i guess rear door wont matter. any help or ideas