I see five Zobel networks (one for each low and mid driver) and a first order filter on that cross-over PCB. It's amazing that hundreds (thousands?) of curves are necessary to optimize the component values of what appears, to the uninitiated, to be a relatively simple cross-over. It's good to see the inductors spaced "far apart" and positioned on different axes. The wire gauge on the inductors is fairly beefy too to minimize parasitic resistance.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated