Originally Posted By Gr8_White_North
he is goin active so the crossovers are before the amp at least thats what it seemed. forgive my poor comprehension but i see no point in passive external.

Agree that if he is using active crossovers and separate amps per frequency band there shouldn't be a need for passive crossovers as well but I didn't see any mention of active crossovers.

That said, one thing that occurred to me from reading this thread is that the beauty of an external crossover (apart from things like power handling) is the ability to switch to active crossovers and tri-amping without having to change the speaker itself.
M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8