Studio Monitor SM 255

Introduced: 1976
Dimensions: 108 x 45 x 36,5 cm
Wight per Box: 25 kg
Bass: 1 x 38,1 cm polypropylene coated
Mids: 2 x 13,3 cm polypropylene coated
Highs: 1 x 2,5 cm dome fastglass
Suggested for amplifiers with: 10-300 Watts per channel
Frequency range: 28 Hz - 22 kHz (+/- 3dB)
Sensitivity: 103 dB
Impedance: 4-8 Ohms
Crossover frequencies: 400 Hz, 2500 Hz
Suggested price (pair): 3000 €

A technical sheet with crossover schematics can be seen here.