The 9887 is made to work in a 3 way system.
Since you're not using rear speakers, get a 4 channel or two 2 channel amps for the front components. Throw away the pasive crosover and let the deck do all the crosover/time alignment and equalizing, just like its meant to do.

Then get it set up with the Imprint system.

Then you can play for hours, trying to get it to sound better than the alpine imprint setiings.

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Alpine CDA-9887, TUA-T500HD, CHA-S634, CHA-1204 & KCA-410C
Pioneer TS-A6981, 6 x GM-5100T
Kicker 2 x CVR15,
MBQ RCE-216
PG MX2
Soundgate LanStar1
PAC SWI-ALP