Slope and xover

[Jazz 10+ year member]

How would you set up the xover on this set up?

Front Speaker Specs: 50hz - 30khz (pair of 4" & pair of 5.25")

Rear Speaker Specs: 50hz - 30khz (pair 4 x 6)

Sub : 50hz - 200hz (single 8 ")

the front and rear channel have an active HPF (in head unit)

the sub channel has an active LPF (in head unit)

from this, how do i determine at which frequency to cut off the HPF and the LPF. and also how do i determine what slope?

thanks for any help its really appeciated.

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[RAM_Designs 5,000+ posts]

I assume these are all coaxial speakers(minus sub)? If so, 80-100hz seems about right with at least a 12db/oct slope. LP the sub at ~80hz.