Yes you can cross at 60 for some overlap of bAss, experiment with 80. Would try large or small... experiment and yes room response. Sounds like a good plan. Nice system...
Guess he is going to trust you too. Has been member since 2020. Money in hand may work for you. Given time, your speakers will sell. CaNt qualify, but think he is really down under. Read All his posts.
Your call...