Forgive my ignorance of the technical brilliance at "measurements taken outside on a turntable" ... and "measurments of the actual impedance of .. drivers":
First: it's raining outside, and my turntable is only able to handle vinyl disk inside (for other purpose inside there is the MM - Method).
Second: using a FA (active Plateamp) the impedance is out of interest.
Agreed I'm old fashioned, coming from changing coil, cap, resistor to find out the correct solution, but you can not tell the story that any simulation is better than reality?
What, you think, would 'shorten' the finding of optimum crossover in XCad compared to real life (expecting you have experience with digital xover)?