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

Rane AC 23B Crossover Data Sheet
DATA SHEET
AC 23B
ACTIVE CROSSOVER
CH 1
LOW
2W: INACTIVE
MASTER
4
6
2
4
8
6
2
0
10
LEVEL
4
8
0
10
LEVEL
MONO MASTER
2
MUTE
6
3W: LOW / MID
2W: INACTIVE
240
400
200
600
4
150
750
100
850
80
900 2
8
MIN MAX
DELAY
SUBWOOFER
70
1k
FREQUENCY
MID
2W: LOW
6
0
10
LEVEL
SUB / LOW
4
8
6
2
MUTE
MID
MIN MAX
DELAY
3W: MID / HIGH
HIGH
2W: LOW / HIGH
1.0k
700
2.0k
550
4
6
2.8k
475
4.5k
350
5.8k 2
8 250
8
190
7.0k
FREQUENCY
4W: MID / HIGH
5W: MID / HIGH-MID
CH 2
LOW
2W: INACTIVE
MASTER
4
6
2
4
8
6
2
0
10
0
10
LEVEL
LEVEL
MONO 4W OR 5W: INACTIVE
4
8
0
10
LEVEL
2
MUTE
LOW
6
3W: LOW / MID
2W: INACTIVE
240
400
200
600
4
150
750
100
850
80
900 2
8
MIN MAX
DELAY
70
1k
FREQUENCY
LOW / MID
MID
2W: LOW
6
4
8
2
6
3W: MID / HIGH
HIGH
2W: LOW / HIGH
1.0k
700
2.0k
550
4
6
2.8k
475
4.5k
350
5.8k 2
8 250
8
7k
190
MIN MAX
MUTE
DELAY
FREQUENCY
4W: INACTIVE
4W: INACTIVE
5W: HIGH-MID
5W: HIGH-MID / HIGH
0
10
LEVEL
0
10
LEVEL
AC 23B
ACTIVE
CROSSOVER
POWER
HIGH
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 2ndorder 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 modification. See the
manual for details.
See the RaneNote Linkwitz-Riley Crossovers for more information, available at www.rane.com.
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
Fully Active Balanced XLR Inputs & Outputs
UL/CSA/CE and 100/120/230 VAC Remote Power Supplies
Data Sheet-
AC 23B
ACTIVE CROSSOVER
Features and Specifications
Parameter
Crossover: Alignment
..........Slopes
..........Range (3-way)
..........Range (3-way)
..........Range (2-way)
Time Delay Adjust Range
Inputs: Impedance
..........Maximum Level
..........Gain Range
Inputs: Type
Outputs: Type
..........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 Requirement
Maximum Current
Unit: Construction
..........Size
..........Weight
Shipping: Size
..........Weight
Note: 0 dBu=0.775 Vrms
Data Sheet-
Specification
Linkwitz-Riley
24 dB per 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 XLR
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
Ω
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
Pin 2 hot per AES standards
1%
1
-0/+4
Ω
dBu
dB
600 Ω 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 23B
ACTIVE CROSSOVER
Block Diagram
Data Sheet-
AC 23B
ACTIVE CROSSOVER
Rear Panel
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 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.
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 continuously
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.
Available Accessories
• 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,” 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).
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 USA TEL 425-355-6000 FAX 425-347-7757 WEB www.rane.com
Data Sheet-
All features & specifications subject to change without notice. DOC 107496
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