The design is a two-way-design with the loudspeaker driver for the high frequencies (crossover frequency 1.400 Hz) being located in the center dome of the large bass speaker. At first sight, this looks like a one-way-broadband design which would be highly unusual for a high-quality loudspeaker box for professional use. When enlarging the picture, the second, smaller loudspeaker driver for the higher frequencies can be seen in the middle of the large speaker.

The year when these loudspeakers first came out was around 1990. In the year 2022, used speaker pairs are in a price range between about 2.000 and 3.000 Euros.

Specifications (from a speaker review on audionostalgia.co.uk)
Frequency Response: 55 – 20,000Hz (+/- 4dB)
Sensitivity: 92dB (1W input, measured at 1m)
Impedance: 6Ω (4Ω min.)
Recommended Amplifier: 10 – 200W
High & Low Frequency Driver: Type 3149R 300mm (12″) Dual Concentric with 51mm (2″) Aluminium Dome Compression Driver and 300mm (12″) Paper Diaphragm
Crossover Frequency: 1,400Hz
Enclosure Type: Bass Reflex
Enclosure Dimensions (HxWxD): 548 x 400 x 275mm (23x16x11″)