As @jgs5607 has said any change to the design (drivers, arrangement, etc) will change the crossover. That isn’t necessarily a bad thing. You will just need something like the omnimic or umik-1 along with DATS to get started on designing your own crossover. It might be a good idea to check to make sure all the parts will work together. You will need a 1″ horn with 2/3 bolt pattern. I was just modeling the 8″ version not too long ago and it wanted something like a 4 cubic foot box for two drivers to be ported fairly flat. That might be problematic depending on the box size you want to design.