Features ATC - Audiophile RCA Connectors ACT - Adaptive Crossover Technology High efficiency Class Full Range Class D Technology Direct Connect Speaker Terminals 4 Gauge Power Wire Inputs APC - Audio Protection Circuit SESI - Signal Evaluation Status Indicator CHM - Collective Heat Management Specifications 4 x 125 Watts @ 4 ohms 4 x 250 Watts @ 2 ohms 4 x 500 Watts @ 1 ohm 4 ohms (Bridged): 2 x 1000 Watts Working Voltage: 12-15 Volts Frequency Response: 15 Hz - 20k Hz Signal to Noise Ratio: 96d