KEF R50 (the pair)

Construction: 2 lanes closed
of recommended amplifier power : from 25 to 100 W

coaxial speaker
Bass : 13 cm in diameter
High frequencies : 2.5 cm diameter ventilated dome and waveguide
magnetically shielded

Measures
Frequency response: 105 Hz - 18.5 kHz (+/- 3 dB)
Switching frequency : 2.5 kHz
Input impedance: 8 ohms (minimum 4.8 ohms )
Sensitivity ( 2.83V / 1m ) : 85 dB
maximum sound level : 107 dB / 1W / 1m

Overview
Dimensions ( WxHxD) : 174 x 180 x 259 mm
Unit Weight: 4.5 kg (each)