45MM 8Ω 0.5W Operation: To be normal music source 0.5watt;Max 1.0 Watt Input: To be normal oscillartor 1.41 volt Impedance: 8Ω&plun;15% measure at 1KHZ Resonant Freq.: 550hz&plun;20% measure at 1.41 volt Freq. response: FO-5000 hz Sensitivity: 85&plun;3dB Frequency response curve: Measure 1watt 0.5meter |