How would an active crossover be an advantage for this system?

[Trepkos 10+ year member]

Kenwood eXcelon KDC-X791

Phoenix Gold RSd65cs 6-1/2" 120W Component Speaker System

Profile AP1000 1000W 2 CH Amplifier (2 ohm Max Rating)

2x Kicker CompVT 12" 2-Ohm Subwoofers

Hifonics TitanTxi1008D Class D Mono Amplifier

American Accesories 4gauge amplifier wiring kit

JL Audio Dual Amplifier 4gauge Wiring Kit

KnuKonceptz Konfused Distribution Block

KnuKonceptz Krystal RCA Cables

1.86cu ft Sonic Boom 2x 12" Subwoofer Enclosure

Any recommendations on one and how would I wire it?

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[genxx 10+ year member]

Can't go active unless you plan on buying another amp for starters. You need 4 channels to run the front speakers. I do not know what the abilities of the Kenwood. If it does not have atleast a 2-way x-over built-in and some EQ ability you are going to need some external processing or a new HU.

I say two way meaning it will do high and mid. Then you would have to use your sub amp x-over it has one built in. You need to lots of research and reading before you even think about going active.