Quantum QB2000D Beta Series 2 Ohm Mono Amplifier Beta Series 2 ohm mono Amplifier with class "AB" circuitry, rated at 14.4 volts 1 x 1000 watts @ 4 ohms, 1 x 2000 w @ 2 ohms QSINK heat management system, Buffered pre-amp input circuitry Continuously variable 12dB low pass-x-over, 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, Fuse type ATC 3 x 30 amp