Bass unit 1 x 125 mm (5.0 in) Treble unit 1 x 25 mm (0.9 in) Frequency response(-6dB) 54 Hz – 30 kHz Nominal impedance 6 Ω Minimum impedance 3.9 Ω Sensitivity (2.83V @ 1kHz) 87 dB/w/m Recommended amplifier power 25-100 W Crossover frequency 2.4 kHz Distortion (120Hz – 20kHz, @2.83Vrms) <0.2 Effective volume 7.0 L Dimensions (per loudspeaker / HxWxD) 284 x 180 x 319 mm (11.2 x 7.1 x 12.6 in) Weight (per loudspeaker) 7.9 kg (17.4 lb