Velodyne SC-600D 400w Subwoofer Amplifier 400W Dynamic 200W RMS Power High Pass Crossover 80Hz (6 dB/Octave) Low Pass Crossover 30-160Hz, Defeatable, 24 dB/Octave Slope INPUT:Line and Speaker Level OUTPUT:Line Level, 80Hz Up, Speaker Level CONTROL:12-volt Trigger x 1, IR Repeater Jack x 1, RS-232 x 1