I have some drivers I want to use in a basement system with a 2way active crossover and SET/ss amps. I'd like to keep the passive components to a minimum. Many questions

I read that the Altec 9862 uses versions of the 416 and 414 together. Does anyone know where they're crossed over or what size/tuning the enclosures are? Is the 414 sealed?

Can I use the 511B/808-8A without eq if the JBL 2404H fills in the top end? Should I skip the 511B altogether?

I saw that JE Labs built a 2-way with the 414 running full range. Can I do that while also running the 416?

I'm only really firm on using the woofers that I have and the 18dB/Octave active crossover because I like all those things. Any tips are helpful