Outstanding sound quality. The PDX1.400M features a revolutionary design that incorporates improved feedback circuitry and power supply filtering system, plus a damping factor that is 350% better than Class A/B amps. It stays efficient at all power levels, which produces less heat and eliminates the need for large heat sinks. RCA output and non-fading pre-amp output. Adjustable gain control. 100W x 4 at 2/4 ohms; 200W x 2 at 4 ohms bridged.