I'm footing around the idea of using a 4 way active network w/ a separate sub,
looking around the web the law of impedance came up with y cabling from a mx-110 and its 100,00k impedance.

if your using the external with 4 amps and a l+r mono amp, how would the crossover arrange the amps, in a series or in parallel.
do i need to consider the impedance at all of the amps.