Stimbo22, I've used active crossovers quite a bit. They are very tricky to say the least. For the most part though, at least so far anyway, I have seen better results using one amplifier to drive the speaker while using a passive crossover.
One thing you want to consider is that nearly all drivers have nuances, odd little peaks and dips in their response. The designer of the crossover, if he is worth his salt, will accommodate these variances. Unless the active crossover is specifically designed for that speaker, it will only provide general curves with no accommodation for actual driver behavior.
I suspect this is why the best systems I have heard have all had passive crossovers.
One thing you want to consider is that nearly all drivers have nuances, odd little peaks and dips in their response. The designer of the crossover, if he is worth his salt, will accommodate these variances. Unless the active crossover is specifically designed for that speaker, it will only provide general curves with no accommodation for actual driver behavior.
I suspect this is why the best systems I have heard have all had passive crossovers.