The Rane AC 22S Active Crossover is a stereo 2-way with a mono subwoofer option, or it can be used as a mono 3-way. It employs state-variable 4th-order Linkwitz-Riley filter alignments to minimize phase difficulties in the critical crossover region.
Simply put, a Linkwitz-Riley alignment is two cascaded 2nd-order Butterworth filters exhibiting identical phase characteristics on their Low pass and High pass Outputs. This characteristic guarantees in-phase outputs at all frequencies. In-phase 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.
To further guarantee the transparent operation, adjustable Delay circuits appear on the Low (& Mid when used in 3-way mode) Outputs of each channel to compensate for any physical misalignment of the drivers. Time correction ensures the mechanical phase alignment of adjacent drivers will be acoustically correct, thus maintaining the integrity of the electrical phase alignment of the crossover’s filters. CD horn equalization is also possible with an internal modification.
The AC 22S uses XLR connectors with active balanced inputs and outputs. The AC 22S improves upon its previous model by incorporating an internal power supply that can be plugged in almost anywhere in the world.
Can the crossover ranges be modified, or for constant directivity horn equalization?
This is a simple modification that requires installing a specific capacitor on the pre-drilled circuit board, determined by your CD horn rolloff point. Instructions are in the AC 22S Manual. If your crossover is older and doesn't match these capacitor indicators, you may find your unit's manual and schematic here, or call or email Chris in tech support at the factory with your serial number. To change any frequency ranges, download this PDF: "Crossover Modifications."
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