Bob, typically driver interaction has a large effect on radiation pattern in the vertical plane but not much in the horizontal plane. Even with the digital crossover, you can see the results of driver interaction in the vertical polar map.
I use a passive crossover, and my horizontal radiation patterns are as smooth if not smoother than the K&H. My vertical pattern probably isn't a good, but that's less critical (as long as the power response is smooth) because we listen within a fairly narrow vertical window anyway.
I found a website that said the big K&H speakers retail for thirty-six grand a pair, but you can mail-order them for a mere twenty grand a pair. That's actually one helluva discount.
Duke
