Kenwood Excelon X501-1 Class D Mono Power Amplifier Class-d 2-ohm stable monoblock amplifier RMS power rating: 4 ohms: 300 watts x 1 chan./ 2 ohms: 500 watts x 1 chan. Total power output: 1000 watts Pulse width modulated MOSFET power supply 3-Way protection circuitry (thermal, overload, and speaker short protection)