Dynaudio's Contour 2.8 - Circuit Description for Crossover Network wanted

[tiefbassuebertr]

How operates this passive high pass filter ?
Is there an all pass function integrated?
Schematic you will find under
Freq.weichen Dynaudio Contour 2.8, Original + Eigenentwurf CH-IV in Hessen - Ginsheim-Gustavsburg | Weitere Audio & Hifi Komponenten gebraucht kaufen | eBay Kleinanzeigen
(last both images shows the schematic diagram)

 

[AllenB]

It looks like a single inductor low-pass with driver impedance rise compensation across the driver and some compensations added for the amp to see a resistance, unless it is intended to be driven from a non-zero impedance.