Robert Koprowski's Manger Horn Of Great Style

I saw this post last week and have not been able to get it out of my head. This is a beautiful piece of audio art.

Specs:
Transducer - 1.2 W05 MANGER MSW- MANGER MTC0803-8 ”
Impedance - 4 Ω
Operating Frequency - 25 Hz-20 kHz (+/-3 dB)
Efficiency - 86 dB 1W/1m Power - 100W
External Crossover division at - 150 Hz
Column weight - 40 kg and 21 kg crossover
Dimensions - 1.3 x 0.5 x 0.5 m
Skeleton enclosure - wood
Thickness of casing - 10-20mm

Anechoic chamber measurements: Accuracy: ± 1 dB 20 Hz to 10 kHz ± 2 dB from 10 to 20kHz Max SPL: 130 dB.

Here is an article about it but turn on your translator.
http://www.highfidelity.pl/@hydepark-1147&lang=