Bass Unit: 1 x 120 mm (4.75 in) Treble Unit: 1 x 22 mm (0.9 in) Frequency Response (-6 dB): 60 Hz – 30 kHz Nominal Impedance: 6 Ω Minimum Impedance: 3.7 Ω Sensitivity (1 m, 2.83 Vrms @ 1 kHz): 87.0 dB Recommended Amplifier Power: 25-90 W Crossover Frequency: 2.6 kHz Effective Volume: 6.9 L Dimensions (HxWxD): 279 x 175 x 281 mm (11.0 x 6.9 x 11.1 in) Weight: 5.5 Kg (12.1 lbs)