Lanzar VIBE221 Vibe 600 Watt 2 Channel Mosfet Amplifier 2 x 150 Watts RMS at 4 Ohms 2 x 300 Watts Max at 4 Ohms 1 x 600 Watts Max at 4 Ohms Bridged 2 x 250 Watts at 2 Ohms RMS MOSFET Automatically Switches to Maintain Rated Power Over a Wide Range of Battery Voltages