It could be that this thread is meant for mains/sub(s) crossover rather than 'full-range' passive crossover replacement - the exchange is good anyway.

Altec: Chances are very high that, the first time you listen to your newly actively-crossed over system, it will sound worse, or VERY worse than it did with the stock passive crossovers. BB4TB: Yup.

Altec: This is because of the fact that not only is all "voicing" which the manufacturer labored long and hard for is now gone, but also the balances between the drivers is all out of whack. BB4TB: Yup - that's why having all kinds of 'adjustability' is a good idea, hence the Behringer unit to aid in determining what's needed before building a less flexible crossover of better components.

Altec: You are now at square one. You are in the driver's seat. You are now at the place where the manufacturer was before he got down to designing a crossover for his speaker. BB4TB: Nearly square one. I do have the manufacturer's frequency response graph and will have a limited set of my own acoustic measurements before and after. I can also make make a schematic and take electronic measurements of the original crossover in action to know about any attenuation beyond frequency division. If I don't like the results, I can always restore the original crossover.

Altec: The active setup most certainly has the potential to sound significantly better than the passive one, but it is NOT plug-'n-play!!!!! BB4TB: Yup.

Altec: Patience, and the ability to "listen through" the sound you are getting, to the sound you want, is everything. BB4TB: It is significant, and part of the enthusiast's experience to explore the possibilities, enjoying the process as much as any potential results.

Beyond a division of frequencies, do the crossovers you made contain any significant 'voicing' and, if so, did you work from a circuit already designed for the drivers you were using, work it out on your own or ???