Frequency Range [+/- 3] dB [Hz]: 49 - 25,000Sensitivity [2.83V/1m] [dB]: 90Nominal Impedance [ohms]: 4 Maximum SPL [dB]: 110Recommended Amp. Power [Watts]Recommended Amp. Power [Watts]: 40 - 300Crossover Frequencies [Hz]: 1000 / 2,800 / 15,000Crossover Principle: N/AHigh Frequency Driver: 1 x 28 mm soft dome, 1 x 17 x 45 mm ribbonLow Frequency/Midrange Driver(s): 2 x 7 Wood fibre cones