Rane AC23S Active Crossover (1U) Stereo 2- / 3-Way



AC 23S Active Crossover
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 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 of the AC 23S, adjustable Delay circuits appear on the Low & Mid 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.

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.
  • Stereo 2- or 3-Way, or Mono 4- or 5-Way
  • Linkwitz-Riley Alignment with 24 dB per Octave Slopes
  • Adjustable Driver Alignment Delays
  • Infrasonic, Ultrasonic and RFI Filters
  • Low & Mid Output Muting (3-Way)
  • Mono Sub Output Option
  • Constant-Directivity Horn EQ Option
  • Input & Output Level Controls
  • Fully Active Balanced XLR Inputs & Outputs
  • Internal Universal Power Supply (100-240 VAC) 
Parameter Specification Conditions/Comments
Crossover Alignment: Linkwitz-Riley Proprietary 4th-order state-variable
Crossover Slopes: 24 dB per Octave
Crossover Range (3-way): 70-1 kHz Low to Mid 41-detent continuously variable pot
Crossover Range (3-way): 190-7 kHz Mid to High  as above
Crossover Range (2-way): 190-7 kHz Low to High  as above
Time Delay Adjust Range: Off to +2 ms Low & Mid Outputs only
Inputs Impedance: 20k Ω 
Inputs Maximum Level: 21 dBu
Inputs Gain Range: Off to +6 dB
Inputs Type: Active Balanced XLR Pin 2 hot per AES standards
Outputs Type: Active Balanced XLR Pin 2 hot per AES standards
Outputs Impedance: 200 Ω
Outputs Maximum Level: 20 dBu 600 Ω or greater
Outputs Gain Range: Off to +12 dB
Band Muting Switches: Yes Low & Mid Outputs only
RFI Filters: Yes
Infrasonic Filter: 20 Hz, 18 dB/Oct, Butterworth Hz
Ultrasonic Filter: 40 kHz, 18 dB/Oct, Bessel Hz Linear phase
Frequency Response: 20-40 kHz dB
THD+Noise: 0.02% +4 dBu, 20-20 kHz
IM Distortion (SMPTE): 0.02% 60 Hz / 7 kHz, 4:1, +4 dBu
Signal-to-Noise Ratio: 92dB re +4 dBu, 20 kHz noise bandwidth
Maximum Power: 7
Universal Line Voltage: 100-240 VAC, 50/60 Hz VAC 7W
Unit Conformity: CE, FCC, CULUS
Unit Construction: All Steel
Unit Size: 1.75" H x 19" W x 5.3" D (1U)
Unit Weight: 5 lb
Shipping Size: 4.25" x 20.3" x 13.75"
Shipping Weight: 9 lb

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