help with Qualio-IQ filter

Hi, I really like the look of what you've done, but I'm confused about a couple of things - hope you don't mind me asking.

First, I saw a post you put on the DIY Biamp 6-24 thread a few days ago. It implies you're intending to use an LX mini active crossover between the bass and midrange drivers, and then you're adding a Biamp 6-24 active crossover to the midrange feed, to divide the mid and tweeter. Is that correct?

If so, what is the passive crossover for?

Second, assuming that there is a purpose to the passive crossover, are you saying you designed it using standard calculators, without any measurements or modelling, and haven't prototyped the speakers with cheaper components?
 
Going to listen for a while with the passive. Then Ill listen a while with the active setup. I like having options. Sometimes you feel like a nut, sometimes you don't. I'll eventuality end up with what sounds best to me. If I don't try out different directions, I'll never know.