Despite it being overkill, use the link below:
Subwoofer Wiring Diagrams
This will help you select the correct configuration for the subs (ie...SVC vs DVC and OHM ratings) in addition to how they should be wired to your amp. Good luck.....
PS...... I run two 8's and it hits hard and clean. Just do a single high quality 12 inch sub. Your money would be better spent on a quality HU, amplification, components and processing. JMHO.......
Oh..I'd appreciate some rep for the link......