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AC 23S

ACTIVE CROSSOVER

Data Sheet-1

Features

•   Stereo 2- or 3-Way, Mono 4- or 5-Way
•   Linkwitz-Riley Alignment with 24 dB per Octave Slopes
•   Adjustable Delays
•   Infrasonic, Ultrasonic and RFI Filters

General Description

The Rane AC 23S Active Crossover can be configured as a 

stereo 2- or 3-way, or a mono 4- or 5-way. It employs 4th-order 

Linkwitz-Riley filter alignments to minimize phase difficulties in 

the critical crossover region. The AC 23S uses XLR connectors 

with active balanced Inputs and Outputs.

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 guar-

antees 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 of the  

AC 23S, adjustable Delay circuits appear on the Low & Mid  

Outputs of each Channel to compensate for any physical mis-

alignment 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. 

In 2- or 3-way stereo mode, the low outputs may be mono'ed 

by moving an internal jumper. Constant directivity (CD) horn 

equalization is possible with an internal modification. See the 

manual for details.

See the RaneNote 

Linkwitz-Riley Crossovers

 for more informa-

tion, available at www.rane.com.

DATA SHEET

•   Low & Mid Output Muting (3-Way)
•   Input & Output Level Controls
•   Fully Active Balanced XLR Inputs & Outputs
•   Internal Universal Power Supply (100-240 VAC)

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