Hello David

I run an all active set-up because I am weak with passives. I realized early on how difficult it was to get it really right on your own. I like to try new drivers and fiddling and voiceing a passive crossover is an art. That said if you are clonning an existing system and you have the crossover schematic there is no reason not to give it a go. You have a baseline, it is a great learning experience and its fun if you like to tinker. I will also be building up a pair and in this case I will be using the JBL designed crossovers.

Rob