JD-A990 Car Amplifier OUT POWER (MAX): 450Wx4 & 900Wx2(BRIDGED) FREQUENCY RESPONSE: 10Hz-50KHz AT 1.5dB INPUT SENSITIVITY: 100mV-2V SIGNAL RATIO: >95dB SUBWOOFER FREQUENCY: 30Hz-250Hz DIMENSIONS(LxWxH) : 330 x 285 x 55(mm)