Technical data: 12 '' Kevlar® Woofer Bass extension to 23 Hz with a maximum SPL of 119.9 dB Footswitch Control Turn on / off subwoofer and crossover (footswitch not included) Redesigned chassis with a lower profile and a forward-firing bass port Powerful, lightweight Class D amplifier Optimized four-position crossover control Universal connectivity: XLR, 1/4 ”TRS and RCA inputs and outputs Input polarity and sensitivity control The Ground Lift switch prevents the formation of ground loops