Rane | AC 23B | Data Sheet | Rane AC 23 Crossover Data Sheet

Rane AC 23 Crossover Data Sheet
DATA SHEET
AC 23 & AC 23B
ACTIVE CROSSOVERS
General Description
The Rane AC 23 Active Crossover can be configured as a
stereo 2- or 3-way, or a mono 4- or 5-way. It employs 4thorder Linkwitz-Riley filter alignments to minimize phase
difficulties in the critical crossover region. The AC 23 uses
¼" TRS connectors with balanced/unbalanced Inputs and
unbalanced Outputs. 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 23, 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. CD horn
equalization is now possible with an internal modification.
Time Delay can also be internally transplanted to the Mid and
High Outputs if desired.
See RaneNote 107 for more information regarding
Linkwitz-Riley designs.
Features
AC 23 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
Low & Mid Output Muting (3-Way)
Input & Output Level Controls
UL/CSA/CE and 100/120/230 VAC Remote Power Supplies
• ¼" TRS Inputs & ¼" TS Outputs
• Active Balanced/Unbalanced Inputs & Unbalanced Outputs
AC 23B Features
• XLR Inputs & Outputs
• Fully Active Balanced Inputs & Outputs
Data Sheet-1
AC 23 & AC 23B
ACTIVE CROSSOVERS
Parameter
Crossover: Alignment
..........Slopes
..........Range (3-way)
..........Range (3-way)
..........Range (2-way)
Time Delay Adjust Range
Inputs: Impedance
..........Maximum Level
..........Gain Range
AC 23 Inputs: Type
..........Connectors: AC 23
AC 23B Inputs: Type:
..........Connectors: AC 23B
AC 23 Outputs: Type
..........Connectors
..........Impedance
..........Maximum Level
..........Gain Range
AC 23B Outputs: Type
..........Connectors
..........Impedance
..........Maximum Level
..........Gain Range
Band Muting Switches
RFI Filters
Infrasonic Filter
Ultrasonic Filter
Frequency Response
THD+Noise
IM Distortion (SMPTE)
Signal-to-Noise Ratio
Unit: Agency Listing
..........120 VAC model
..........230 VAC model
Power Supply: Agency Listing
..........120 VAC model
..........230 VAC model
..........100 VAC model
Power Supply Requirment
Maximum Current
Unit: Construction
..........Size
..........Weight
Shipping: Size
..........Weight
Note: 0 dBu=0.775 Vrms
Data Sheet-2
Specification
Linkwitz-Riley
24 dB/Octave
70-1 kHz Low to Mid
190-7 kHz Mid to High
190-7 kHz Low to High
Off to +2
20k
+21
Off to +6
Active Balanced/Unbalanced
¼" TRS
Active Balanced
XLR
Floating Active Unbalanced
¼" TS
100
+20
Off to +6
Active Balanced
XLR
200
+20
Off to +12
Yes
Yes
20 Hz, 18 dB/Oct, Butterworth
40 kHz, 18 dB/Oct, Bessel
20-40 kHz
0.02
0.02
92
Limit
5%
1
1
-0/+4
Units
ms
ohms
dBu
dB
Conditions/Comments
Proprietary 4th-order state-variable
41-detent continuously variable pot
as above
as above
Low & Mid Outputs only
Pin 2 hot per AES standards
1%
1
-0/+4
ohms
dBu
dB
1%
1
-0/+4
ohms
dBu
dB
600 ohms or greater
Pin 2 hot per AES standards
600 ohms or greater
Low & Mid Outputs only
3%
3%
+0/-3
.01
.01
2
Hz
Hz
dB
%
%
dB
Linear phase
+4 dBu, 20-20 kHz
60 Hz / 7 kHz, 4:1, +4 dBu
re +4 dBu, 20 kHz noise bandwidth
Class 2 Equipment
UL & CSA
VDE, SELV
CE-EMC
CE-Safety
National Electrical Code
Class 2
Safety Extra Low Voltage
EMC directive 89/336/EEC
Exempt per Art. 1, LVD 73/23/EEC
UL
CSA
CE-EMC
CE-Safety
Built to JIS
18 VAC w/center tap
750
All Steel
1.75" H x 19" W x 5.3" D (1U)
5 lb
4.25" x 20.3" x 13.75"
9 lb
File no. E88261
File no. LR58948
EMC directive 89/336/EEC
LV directive 73/23/EEC
Japan only
Model RS 1
RMS Current from Remote Supply
0.1
Vrms
mA
(4.4 cm x 48.3 cm x 13.3 cm)
(2.3 kg)
(11.5 cm x 52 cm x 35 cm)
(4.1 kg)
AC 23 & AC 23B
ACTIVE CROSSOVERS
Block Diagram AC 23
See Operating Manual for Hook-Up and Configuration Options
Block Diagram AC 23B
Data Sheet-3
AC 23 & AC 23B
ACTIVE CROSSOVERS
Rear Panels
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 equalization 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 23 rather than the AC 22 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 23 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 22 is the one for
you.
Available Accessories
Architectural Specifications
The active crossover shall contain 4th-order LinkwitzRiley 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 continuously variable control with 41 detents to allow mechanical
reference of crossover setting.
Signal inputs shall be active balanced/unbalanced designs
terminated with ¼" TRS (tip-ring-sleeve) or XLR connectors.
Signal outputs shall be unbalanced terminated in ¼" TS
connectors or 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 +6 dB (+12 dB AC 23B balanced) 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 23 or AC 23B
Active Crossover.
• SC 1.7 Security Cover
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,” Rane Note 107, (1983).
4. D. Bohn, “Why Not Wye?” Rane Note 109, (1984).
5. D. Bohn, “Overload Characteristics of State-Variable Crossovers,” Rane Note 112, (1985).
6. D. Bohn, “Linkwitz-Riley Active Crossovers Up To 8th-Order: An Overview,” Rane Note 119, (1989).
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 TEL (425)355-6000 FAX (425)347-7757 WEB http://www.rane.com
Data Sheet-4
All features & specifications subject to change without notice. DOC 103044 PN 07560 6-99
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