I put together a speaker kit, the LM-1, and posted the simulation files so you can play with crossover design yourself. This may help you get a better understanding of polarity and phase relationships.
https://forum.audiogon.com/discussions/try-your-hand-at-crossover-design-free
Best,
Erik
https://forum.audiogon.com/discussions/try-your-hand-at-crossover-design-free
Best,
Erik