Behringer Super-X Pro CX3400 Professional High-Precision Stereo 2-Way/3-Way/Mono 4-Way Crossover Professional stereo 2-way/3-way/mono 4-way crossover featuring state-of-the-art Linkwitz-Riley filters with 24 dB/octave Individual Limiters on each output for optimal loudspeaker protection Adjustable time delay for phase alignment between drivers CD horn equalization for constant directivity horn compensation Absolutely flat summed amplitude response, zero phase difference