Tweeter 1-inch (25mm) Mid-bass driver 4-inch (116mm) Power output (RMS) 21W+21W Frequency response 55Hz-20KHz Audio inputs Line In 1, Line In 2 Input sensitivity Line In1: 750±50mV Line In2: 550±50mV Signal-noise ratio ?85dB(A) Noise level 30dB(A)