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 The Rane AC 23B employs 4th­ order Linkwitz­Riley filter alignments to minimize phase difficulties in the critical crossover region. Simply put, a Linkwitz­Riley alignment is two cascaded 2nd­order Butterworth filters exhibiting identical phase characteristics on their Low­pass and High­pass outputs. This characteristic guarantees in­phase outputs at all frequencies. In­phase outputs are mandatory for proper acoustic summing of common signals from adjacent drivers in the crossover region. An added benefit of this topology is steep 24 dB per octave rolloff slopes. A slope of this magnitude guarantees drivers designed to produce a specific range of frequencies, and no more, will not be driven past their limits, thereby minimizing distortion and driver fatigue.