ABC address the woofer system and midrange of a 3-way dipole system like the NaO II or NaO Mini. It does not address the mid tweeter crossover. Discussion of suitable tweeters is directed at domes and appropriate crossover points. It was not intended to model rear tweeters.
The mid/tweeter x-o is left to the user to do with pother software. The point of ABC is to reduce the 3-way dipole problem to a simple, conventions 2-way crossover problem.
I looked at tweeters similar to the A-C ribbon when developing the NaO. It worked ok, but I didn't like the result. But I'm not particularly a fan of ribbons.
