High speed MOSFET switching power supply High current, high efficiency MOSFET outputs stable to 1 ohm Externally bridgeable with built-in gain sync - double the power! Full range RCA outputs Continuously variable 12 dB/octave low-pass crossover Built in blue LED top illumination External LED/fan power jack 180 Degree phase invert switch Switchable 30Hz, 24dB/octave subsonic filter Switchable 8 dB bass EQ function Thermal, DC offset, reverse polarity, over/under voltage and short circuit protection