Specs Impedance : 4-6 ohms Bass driver : 6-1/2 Dynamic cone woofer Midrange/Tweeter : 26" Aluminium/Kapton ribbon (etched 6 segment) Max Sound Level : 107 dB @ 4 meters with a 50 W amplifier Frequency response : (-3 dB @ 40 Hz) to 20 kHz Crossover frequency (electronic) : 800 Hz Suggested amp power : 50 W (into 8 ohms) 100 W (into 4 ohms) Height : 100 cm Width : 35 cm Deep : 22 cm Weight : 24 kg / each