ITB Silver markII sub-12 is the perfect subwoofer for medium to large home theaters or listening rooms. A 150 watt amp, long-throw front firing 12" driver, and dual rear ports produce impressively deep and powerful bass. Since the ports are rear-mounted and feature a flared design, air turbulence at high listening levels is minimized for the cleanest sound. The amplifier features high and low level inputs, filtered high and low level outputs, phase switch, volume control, auto on/off (activated by an input signal) and a variable 12dB/octave electronic low pass filter. This subwoofer reproduces serious low-frequency bass that will rival the performance of much more expensive subwoofers.