Someone here once told me that I would probably blow-up the diaphragm in my 32B horn using the 500hz 501-8A crossover because the horn wasn't loading the diaphragm at those low frequencies. Hasn’t happened yet, but I can’t remove the loading cap screws out to look and check if the diaphragm is aluminum or a symbiotic and am too lazy to take the whole horn out of the box to really get at the screws.