Rane AC 23B User manual

AC 23B
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 23B 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 23B 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 23B, 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 modifica-
tion. See the manual for details.
See the RaneNote Linkwitz-Riley Crossovers for more
information.
MONO 4W OR 5W: INACTIVE
MIDMONO MASTER SUBWOOFER SUB / LOW HIGHLOW LOW / MID
4W: MID / HIGH
5W: MID / HIGH-MID 4W: INACTIVE 5W: HIGH-MID / HIGH
4W: INACTIVE
5W: HIGH-MID
100
2
4
8
6
100
2
4
8
6
100
2
4
8
6
100
2
4
8
6
100
2
4
8
6
100
2
4
8
6
100
2
4
8
6
100
2
4
8
6
MAXMIN
2
4
8
6
MAXMIN
2
4
8
6
MAXMIN
2
4
8
6
MAXMIN
2
4
8
6
100
80
1k
900
850
150
200
240
750
600
400
190
250
7.0k
5.8k
550
475
350
700 2.0k
2.8k
4.5k
1.0k
190
250
7k
5.8k
550
475
350
700 2.0k
2.8k
4.5k
1.0k
100
80
1k
900
850
150
200
240
750
600
400
3W: MID / HIGH
2W: LOW / HIGH
3W: LOW / MID
2W: INACTIVE
2W: INACTIVE 3W: MID / HIGH
2W: LOW / HIGH
3W: LOW / MID
2W: INACTIVE
2W: INACTIVE 2W: LOW
ACTIVE
CROSSOVER
70 70
2W: LOW
LEVEL LEVEL
MUTE
LEVEL LEVEL MUTE FREQUENCYDELAY DELAYLEVEL FREQUENCY FREQUENCYLEVEL DELAY
MUTE FREQUENCY LEVEL DELAY MUTE LEVEL
AC 23B
CH 2
MASTER
CH 1
MASTER
POWER
FREQUENCY
LOW MID LOW MIDHIGH HIGH
DATA SHEET
• Low & Mid Output Muting (3-Way)
• Input & Output Level Controls
• Fully Active Balanced XLR Inputs & Outputs
• UL/CSA/CE and 100/120/230 VAC Remote Power Supplies

AC 23B
ACTIVE CROSSOVER
Data Sheet-2
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Features and Specifications

AC 23B
ACTIVE CROSSOVER
Data Sheet-3
Block Diagram

AC 23B
ACTIVE CROSSOVER
Data Sheet-4 All features & specifications subject to change without notice. DOC 106002 PN 12958 8-02
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 USA TEL [phone] FAX [phone] WEB http://www.rane.com
References
1. S.H. Linkwitz, “Active Crossover Networks for Noncoincident Drivers,” J. Audio Eng. Soc., vol. 24, pp. 2-8 (Jan/Feb 1976).
2. D. Bohn, “A Fourth-Order State-Variable Filter for Linkwitz-Riley Active Crossover Designs,” presented at the 74th
Convention of the Audio Engineering Society, New York, Oct. 9-12, 1983, preprint no. 2011.
3. D. Bohn, “Linkwitz-Riley Crossovers,” RaneNote, (1983).
4. D. Bohn, “Why Not Wye?” RaneNote, (1984).
5. D. Bohn, “Linkwitz-Riley Active Crossovers Up To 8th-Order: An Overview,” RaneNote, (1989).
Rear Panel
Available Accessories
• SC 1.7 Security Cover
Architectural Specifications
The active crossover shall contain 4th-order Linkwitz-
Riley filters. Provisions shall exist to correct for driver
misalignment by adding time delay to the low and mid
frequency outputs.
The crossover frequency shall be controlled by a continu-
ously variable control with 41 detents to allow mechanical
reference of crossover setting.
Signal inputs and outputs shall be of active balanced
design terminated with XLR connectors. RFI, infrasonic, and
ultrasonic filters shall be built-in.
The active crossover shall afford an input level range of
Off to +6 dB. The output level controls shall afford a level
range of from Off to +12 dB with muting capability on the
low and mid frequency outputs. The crossover shall supply
two independent channels.
The unit shall be exempt from agency safety requirements
and powered from a UL listed, CSA certified remote power
supply (120 VAC) or CE approved (230 VAC) via a rear
panel modular plug input. The unit shall be constructed
entirely from cold-rolled steel, and mount into a standard 1U
EIA rack.
The unit shall be a Rane Corporation AC 23B Active
Crossover.
Choosing the Right Configuration:
Mono, Dual Mono, or Stereo?
Very few systems indeed will utilize a two channel
crossover for the purpose of true stereo imaging. Discrete
stereo channels which are run from the mixing board are
usually used for panning effects and/or for separate equaliza-
tion of left and right speaker stacks. Different sides of the
room often require significantly different equalization due to
varying room acoustics, dimensions, positioning of speaker
stacks near walls, curtains and the like.
Even though you may not plan to use stereo equalization
or panning effects, it is recommended that your system utilize
discrete crossover channels for each stack of speakers to
ensure flexibility and control for consistent, optimum sound
quality. For example, if you plan to run a multi-stack system
mono three-way, use the AC 23B rather than the AC 22B for
separate control over each set of speakers—especially since
phase alignment may differ with each stack requiring separate
time delay adjustments. Even with only a single system
equalizer, the AC 23B can deliver the extra independent
control which can make a difference in sound throughout the
listening area. If all drivers are built into a single cabinet, or
you are running bi-amped monitors, then the AC 22B is the
one for you.
MONO 5W (CHANGE INTERNAL SWITCH FOR MONO 4W)HI MID OUT-5W LOW OUTHIGH OUT OMIT-4W OMIT MONO
N108
MADE IN U.S.A.
RANE CORP.
LOW-3W / OMIT-2WMID-3W / LOW-2WHIGH OUT
3W 2W
CHANNEL 2
STEREO CHANNEL 1 STEREO
MONO
MONO 4W / 5W IN OMIT MONO SUB OUTMID OUT
LOW-3W / OMIT-2WMID-3W / LOW-2W
3W 2W
STEREO
STEREO 3W / 2W HIGH OUT
PIN 3=NEGATIVE
PIN 1=CHASSIS GND
PIN 2=POSITIVE
AC 23B
CLASS 2 EQUIPMENT
CHANNEL 2 IN CHANNEL 1 IN
MONO: SET SWITCHES AS SHOWN
260mA
POWER