Rated Impedance: 326.66Ω(15 W),653.3Ω(7.5W),1289.47Ω(3.8W),
                          2722.22Ω(1.8W),5444.44Ω(0.9W) 
Rated Power: 15 W
Max. Power: 20 W
Sensitivity: 103 dB ± 3dB , 1W/1M 
Frequency Range : 400 Hz ~ 5 KHz  -10dB / ±20% Hz
Whistling : 35  Volts   
Rated Voltage: 70/25 V Power Taps              
                      70V：15-7.5-3.8-1.8-0.9W       
                      25V：15-7.5-1.8-0.94-0.48W
Dimension: 218 ^Фx 232 ^D mm
Weight: 1.8 kg