LF Audiotechnology C-Quenze 18H52-17-06-SD FRD & ZMA

You need the box in which they will be used too. I mean, who would design a crossover for these fancy speakers without measuring them in-situ? A cheap measurement setup (even with the occasional old secondhand laptop) will set you back less than one C-Quenze. But that is only my humble opinion.

But, if you persist, you could import the FR graph from the AT website and simulate the impedance in a simple spreadsheet (the Rdc and Le are given). Don't forget the phase calculations on the ZMA file tho.