The CX23 is a 2-way stereo or 3-way mono active crossover designed to split frequencies so that low frequencies are delivered to the amp driving the sub cabinets and mid/top frequencies are delivered to the amp driving the mid/top frequency cabs. This type of system is more efficient and delivers more accurate sound quality, especially in larger PA systems. 2-way stereo, 3-way mono crossover 19" rack mountable Butterworth filters - 18dB/octave Continuously adjustable cutoff frequencies 40Hz ultra-low frequency cut Phase invert function Inputs and outputs via XLR