Rated Impedance 8 ohm ± 15% at 400Hz Rated Power 30 W Max.Power 50 W Sensitivity 87 dB ± 3dB , 1W/1M at 400,500,600,700 Hz-Avg. Frequency Range 100 Hz ~ 20KHz -10dB / ±20% Hz Resonance Frequency 140Hz ± 20% Whistling 9 Volts D.C Resistance(Rdc) 6.8 ohm ± 10% Termination Binding post Baffle ABS Mesh Grille Steel Weight 1.74 kgs