I have a behringer euro power mixer, a dbx crossover, two crate amps, two jbl speakers, 2 subs, and a couple mackie speakers for monitors. All the speakers are passive. The crossover only has xlr inputs and the main outs on the mixer are 1/4”, so I am waiting on some balances 1-4” to xlr patch chords. From the crossover I can run xlr patches to the amps, low channel to the subs, mids to the speakers, and run the monitors off of the power mixer speakon outs. Does this seem like the best way to go. For some reason we always use to piggy back the speakers from the subs, and we ran one amp per left and right, and the sub cables had two connectors on the amp end. Not sure how the crossover could be used in that set up.
Main speakers should get the high output and the crossover should be set for 2-way operation.
It can't and that would send a fullrange signal to the mains which defeats the purpose of having subs. Your plan above is better.