Elite Audio EA400.4 4 Channel Amplifier - 50w x 4 @4 Ohm, 75w x 4 @2 Ohm, 160w x 2 @4 Ohm Bridged - Frequency Response 10hz to 30KHz - Signal To Noise 105db - Damping Factor 100< - Efficiency @4 Ohm 85% - Input Sensitivity 6V - 0.2V - High Pass Filter 50Hz to 500Hz - Low Pass Filter 50Hz to 500Hz - Working Voltage 9 to 16 volts - Dimensions 1600mm L x 120MM W x 50MM H - Clipping Indicator On Amplifier - Free Shipping