Altec went to considerable effort in designing their passive crossover to EQ and voice the drivers to give the flattest possible response. Hopefully the same was done with this active crossover otherwise you'll end up with one colored speaker.
I am very interested your analog crossover. I want to go in the crossover bi tri amp world. But I couldn’t find many technical information and experience information talk about analog crossover.
Analog crossover in Altec-19 system was similar as today I listen in my active audio system Nida. Some technical details you can see at: nida.nida-audio.com/en/components/loudspeakers/
