The SC-600 is a matching amplifier to the SC-600 IW and SC-600 IF/IC subwoofers. The 400 Watt amplifier is digitally tuned for dynamic bass and includes distortion limiting electronics. Twin subwoofers can be installed using a rear-panel pass through on one amp to a second SC-600D. (If you want to use one amp to drive two subwoofers, use the SC-602.) The amplifier comes with a remote control with a one-button, 5-band, Auto-EQ room bass optimization feature, four listening presets, night mode, volume controls, phase control and mute mode. The 2 unit high amplifier is easily rack-mounted and uses conventional speaker wires. The amplifier front panel has duplicate controls as well as a mic jack for the Auto-EQ function, low pass crossover frequency control, 12-volt trigger, IR repeater jack and an RS-232 control input that is Crestron certified. The crossover can be set from 30 Hz to 160 Hz. The phase can be set to 0, 90, 180 or 270 degrees. If you are buying an SC-600 series subwoofer, you must power it with either an SC-600 or SC-602 amplifier to reap the benefits of the model-specific EQ settings; no other amplifier includes these.