Pre-amp to sublime audio active crossover. (or equalizer then to xover)
sublime acoustic active crossover has
2 sub out (rca) Make sure you set for single sub though if you only use one.
low out (yes … l/r rca)
mid/high out. (yes .. l/r rca)
2x tekton 2x10 self powered at 300w. Fed from the 2 sub outs from the xover.
low outs to the m400 to lows on biamp speakers.
mid/high outs to m400a to mid/high on bi-amp speakers.
I run bi amp tekton Double Impact SE with single berylium center tweeter + the 2 tekton 2-10 subs.
You can order the active crossovers at the crossover frequencies and slopes you want. To change is just swapping a small board. Different/extra boards are like $12 so playing with different crossover points won’t break the bank.
https://sublimeacoustic.com/products/k231-stereo-3-way-active-crossover