The Electrix KINGX has a mode switch to select 2-way stereo or 3-way mono operation modes, Low and high frequency gain controls for fine tuning of individual bandwidth, State Variable Linkwitz-Riley filter design, Range switch to adjust crossover range from 80Hz to 9kHz, 24dB per octave crossover slopes for greater driver protection, Automatic servo-function allows the unit to work with unbalanced source loads, Mono bass switch for mono bass option in stereo operation mode, and Balanced XLR inputs and outputs.