Phase and Impedance are wild.
I wish Danny would post the new graphs, but maybe he's waiting till Tuesday when he posts our Tech Talk Tuesday video that's dedicated to the Forte III upgrade. But just off memory I can say a few things.
Phase with the new crossover is better than the old one. But we discovered that phase will never be perfect because the midrange driver is physically located FAR back from the tweeter and from the bass woofer. So perfect (or even good) phase is impossible. You'd have to change the design of the box and the driver layout significantly in order to address phase. But I think it's less of a problem in this design for reasons I'll get to in a second.
Impedance definitely improves between the new crossover and also bracing/stuffing the cabinet. The improvement doesn't radically change the nature of the speaker. What I think it does is allow amps, especially tube amps, to sound more dynamic and lively. Which is a very good thing.
OK, back to phase and why it might not matter much in this design. From listening to other speakers that have GREAT phase and this speaker that has not so great phase, the biggest thing you seem to lose is soundstage depth. That sense of a large acoustic space being created behind the speaker is just not there. But here's the thing - this speaker was designed to be placed against a wall or in a corner. Specifically the baffle step response was tuned so it's depending upon a boundary to "fill in" the upper bass/lower mids. So this speaker, when placed properly, will never be able to produce a deep soundstage anyway because of the wall.
So you lose soundstage depth. But if you look at the other major measurement, spectral decay, you see what you gain - ultra clean response and of course the horns themselves are very dynamic in a room. The net result is you end up with a speaker that doesn't "recreate the original event" like my Super 7s can. No, the Forte's create their own, new musical event by pushing the sound out toward you in a very exciting way. Not sure if that makes any sense, but that's the best I can explain what I'm hearing.