^^yeah, turn the amp's cross over to all pass, off, or no cross over (whatever they call it on your amp). This will disable the amp's cross over and only your deck will do the crossing. You don't want to use both as it will screw up the slope rates, and you really won't know what you're getting.

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2004 300M SPECIAL
Alpine CDA 9833
Alpine Pxa-h701
Alpine Rux-c701
Rockford fosgate p400-4
Rockford fosgate p4004
Hifonics BX 1205D
JBL c608 GTi
JBL p693
Infinity 2.5" center channel
Alpine type R 12"(2)
all active SQL set up with 1900 watts rms