D'Appolito 2-way horn floorstander (first project), advice needed

Good thinking. Try to get the larger breakup region down far enough.
Well, I got spoiled by those 12 inch Beymas' low end extension and price so now I'll have to cross even lower, more like 1100-1300 if I want to avoid woofer breakup, I don't think the tweeter I've chosen will handle that however.

Or maybe it will since I'll have to use resistors to attenuate it so that it matches the woofers, which is gonna increase the power handling from the amp. We'll see I guess.