To all the experts out there, i got a headache here,

i'm going active with these gadgets but seems like the crossover part is not so easy as it seems

my gear:

HU - Alpine 9855
-build in crossover

Component - Focal 165vr
Nominal impedance 4 Ohms
Cut-out diameter 141mm (5.5")
Woofer 165mm (6-1/2")
Tweeter TNB Aluminum-Magnesium inverted dome tweeter
Voice coil 32mm (1-1/4")
Magnet 90mm (3-9/16")
Frequency response (+/-3dB) 60Hz - 28kHz
Sensitivity (2.83V/1m) 94.5dB
Nom. power 75W
Max. power 150W


How to set the cross over level for mid and tweeter in the HU?

MID's Frequency? Level? Slope?
Tweeter's Frequency? Level? Slope?

TQVM

i wan to go active, but i dun dare to flip the switch first, coz i dono how to adjust the slope thingy...