or. if your trying to accomplish a 4 way active setup. *cough* u could get a head unit+processor that is built for it. alpine and PIONEER come to mind.

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Pioneer DEX-P90rs + DEQ-P90rs (from europe)
Front Stage - Focal Utopia Be No.7 (active) Focal Utopia Be 13ws (x2)
Front Stage + More Bass - JL Audio 8w7 (x2)
For Beating Brains Out - JL Audio 12w7
Amps - JL Audio 300/4 (tweets/mids) JL Audio 450/4 (mid-bass/subwoofer) JL Audio 500/1 (8w7's) JL Audio 1000/1 (12w7)
250amp Alternator, Stinger SP1700 (battery)
All Monster Cable (lots of it)