All ThunderStorm subwoofers have minute commands such as full range and 80Hz switches, phase switches (0 °, 180 °) and variable frequency subwoofer frequency (60 to 140Hz) to adjust your ThunderStorm to suit a specific environment. The TS112 has a very efficient 400W PWM amplifier that pushes a 12 "proprietary Woofer. This provides a frequency response from 24Hz to 300Hz for a maximum output of 112 dB (SPL @ 1m). It also delivers the volume of the complete stereo system, comfortably seated in your optimum position. Like all EVE Audio subwoofers, it has balanced XLR inputs and outputs (Stereo In and Out, LFE In, LFE / Sub out) for greater convenience.