Configuration: -way Active speaker system Freq Response(-10dB): 45-20KHz Sensitivity (1W@1m): 98dB Nominal Impedance: 4 ohms Amplifier: LF 180 Watts HF 40 Watts dispersion(HXV): 90°X45° Crossover Freq: 2.5KHz Low Frequency: 15" Woofer High Frequency: 1.35" titanium diaphragm compression driver Input Connector: USB MP3 Player/MIC/RCA Dimension(WxDxH): 580 X 470 X 845mm