It would be so much cheaper and less confusing if you were to just buy some original 500hz/800hz Altec crossovers.
Even better Altec solution would be the N1201-8A or model 19 crossovers.Then you only need one mono amp per side. Plus a stereo preamp. Or one integrated amp total.
Especially since you don't seem to know much about loudspeakers.
Sell the electronic crossovers, you might even come out ahead in the $ department.

Ron