I'm thinking of building my own crossovers. I'd like to run the 511b horn/BMS 4550 driver out of phase with the 2235 or ME150H and use a baffle step on the woofer to time align both drivers at 800Hz. I kinow I should use as steep a slope as possible when trying to time align this way, but too steep a slope will show the crossover more. I'm thinking of a second order Bessel.

Will Zilch's HF attenuation for the 811b/BMS 4550/N-800F (1200Hz) but adjusted for 8 ohm drivers work?

Is this a steep enough slope to not get out of phase cancellations as I move away from the 800hz crossover point?

Is the Bessel an appropriate curve to integrate the horn and cone?

Jorg