DESC: Four Channel Amplification 4 x 75 Watts Total Output Variable Gain Control Accepts High or Low Impedance Inputs Gold Plated RCA Inputs High Level MOLEX Input Output Impedance:4-8 Ohms Easy Access Speaker Connections Remote Turn On/Off Thermal/Short Circuit/Overload Protection Heavy Duty Aluminum Alloy Heatsink Power On LED Indicator Frequency Response:20-30k Hz S/N Ratio:>85dB