I picked up 6 JBL 4825 speakers. These have 2204 or 2206 12" woofers, a 2344a (modified) waveguide and 2425 drivers.

I was thinking of stealing the waveguides to make some 4430 clones, but in review of this system, it is begging for upgrade and subwoofer support.. Would the 4430 crossover be a good starting point? I think there was a simplified version called a Z19?