Head unit crossover?

[dirtracer27x]

So I'm puting together a old school system,as of now this is what it will consist of.

2 Phoenix gold ms 275

2sets Boston 6.5lf

Head unit still up in the air

1 12 Boston 12lf

Audio control crossover

My question is are the built in xovers in the new head unit work well,or should I stick with the audio control? Also does anyone have any wiring suggestion for my 2 amp setup

Thanks.

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[dirtracer27x]

Anyone?