Quantum QPRO1500 Beta Series Pro Audio 2 Channel Amplifier Beta Series 2 ohm mono Amplifier with class "AB" circuitry, rated at 14.4 volts 2 x 150 watts @ 4 ohms, 1 x 600 w @ (Bridged) 2 x 300 w @ 2 ohms QSINK heat management system,buffered pre-amp input circuitry, continuously variable 12dB low pass-x-over,continuously variable 12dB bass boost @ 45Hz Continuously variable subsonic filter (15-55Hz) (Mono Amps) Direct-connect integrated speaker and power wire terminals Full range RCA line outputs for easy daisy chain configuration,variable input level control, DC-DC PWM power supply,DC short circuit protection, Bass remote capability