DESC: 4 Channel Amplification 4 x 75 Watts Total Output Variable Gain Control Accepts High or Low Impedance Inputs Gold Plated RCA Inputs High/Low Level Inputs Output Impedance: 4-8 Ohms Easy Access Speaker Connection Remote Turn On/Off Adjustable Gain Control Thermal Protection Overload Protection Load Dump Over Voltage Heavy Duty Aluminum Alloy Heatsink Power On LED Indicator Frequency Response: 20-30kHz THD:Signal to Noise Ratio:>90dB