Boss Audio RS80 8" Amplified Subwoofer: * RCA low level input * High level input * Green and red LED power status indicator * Phase Selector Switch: 0 or 180 degrees * Adjustable Input Sensitivity: 0.2V to 6V * 0 to +12dB variable bass boost * Subsonic filter (20 - 50Hz) * Low pass filter (50 - 150Hz) * Soft delay remote turn-on * Thermal, short and overload * Protection circuits