Rane AC 22B User manual

AC 22B
ACTIVE CROSSOVER
Data Sheet-1
Features
• Stereo 2-Way or Mono 3-Way
• Linkwitz-Riley Alignment with 24 dB per Octave Slopes
• Adjustable Delays
• Mono Subwoofer Switch and Output
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, adjustable
Delay circuits appear on the Low (& Mid when used in 3-way
mode) Outputs of each channel to compensate for any physical
misalignment of the drivers. Time correction ensures the me-
chanical 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 also
possible with an internal modification.
See the RaneNote Linkwitz-RileyCrossovers: A Primer, avail-
able from our website.
General Description
e Rane AC 22B Active Crossover is a stereo 2-way with a
mono subwoofer option, or it can be used as a mono 3-way. ey
employ state-variable 4th-order Linkwitz-Riley filter alignments
to minimize phase difficulties in the critical crossover region.
e AC 22B 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 characteris-
tics on their Low pass and High pass Outputs. is 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
CH 1
MASTER
POWER
DELAYLEVELLEVEL FREQUENCY LEVEL
LOW
MUTE
LOW / HIGH HIGH
LEVEL LEVEL FREQUENCY
CH 2
MASTER
STEREO LOW LOW / HIGH
MUTE
HIGH
LEVELDELAY
AC 22B
MASTER LOW LOW / MID MONO MID MID / HIGH HIGH
MONO SUB
INACTIVE INACTIVE
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
ACTIVE
CROSSOVER
3.0k
70 3.6k
120
75
80
90
250
180
300
700
1.5k
2.0k
1.0k
500
400
3.0k
70 3.6k
120
75
80
90
250
180
300
700
1.5k
2.0k
1.0k
500
400
INACTIVE: MONO SUB
DATA SHEET
• Infrasonic, Ultrasonic, and RFI Filters
• Low Output Muting (2-Way)
• Input & Output Level Controls
• Fully Active Balanced XLR Inputs & Outputs
• UL/CSA/CE and 100/120/230 VAC Remote Power Supplies

AC 22B
ACTIVE CROSSOVER
Data Sheet-2
Features & Specifications
Parameter Specication Limit Units Conditions/Comments
Crossover: Alignment Linkwitz-Riley Proprietary 4th-order state-variable
..........Slopes 24 dB per octave
..........Range 70-3.6 kHz Low to High 41-detent continuously variable pot
Time Delay Adjust Range Off to +2 5% ms Low & Mid Outputs
Inputs: Type Active Balanced
..........Connectors XLR pin 2 hot per AES standards
..........Impedance 20k 1% Ω
..........Maximum Level 21 1 dBu
..........Gain Range Off to +6 -0/+4 dB
Outputs: Type Active Balanced
..........Connectors XLR pin 2 hot per AES standards
..........Impedance 200 1% Ω
..........Maximum Level +20 1 dBu 600 Ω or greater
..........Gain Range Off to +12 -0/+4 dB
Band Muting Switches Yes Low & Mid Outputs
RFI Filters Yes
Infrasonic Filter 20 Hz, 18 dB/oct., Butterworth 3% Hz
Ultrasonic Filter 40 kHz, 6 dB/oct., Bessel 3% Hz Linear Phase
Frequency Response 20 Hz - 40 kHz +0/-3 dB
THD+Noise 0.02 .01 % +4 dBu, 20 Hz - 20 kHz
IM Distortion (SMPTE) 0.02 .01 % 60 Hz / 7 kHz, 4:1, +4 dBu
Signal-to-Noise Ratio 92 2 dB re +4 dBu, 20 kHz noise bandwidth
Unit: Agency Listing
..........120 VAC model Class 2 Equipment National Electrical Code
UL & CSA Exempt Class 2 equipment
..........230 VAC model CE-EMC EMC directive 89/336/EEC
CE-Safety Exempt per Art. 1, LVD 73/23/EEC
Power Supply: Agency Listing Class 2 Equipment
..........120 VAC model UL File no. E88261
CSA File no. LR58948
..........230 VAC model CE-EMC EMC directive 89/336/EEC
CE-Safety LV directive 73/23/EEC
..........100 VAC model Built to JIS Japan only
Power Supply Requirement 18 VAC w/center tap 0.1 Vrms RS 1 (see data sheet)
..........Maximum Current 160 mA RMS current from remote supply
Unit: Construction All Steel
..........Size 1.75"H x 19"W x 5.3"D (1U) (4.4 cm x 48.3 cm x 13.3 cm)
..........Weight 4 lb (3 kg)
Shipping: Size 4.25" x 20.3" x 13.75" (11 cm x 52 cm x 35 cm)
..........Weight 8 lb (5 kg)
Note: 0 dBu=0.775 Vrms

AC 22B
ACTIVE CROSSOVER
Data Sheet-3
0 dB
RFI
FILTERINPUT
FILTER
RFI 0 dB
(18 dB/octave)
LOW
FILTER
20 Hz
(Off to +6 dB)
CH. 1 LEVEL FREQUENCY
(70 Hz-3.6 kHz)
(0-2 ms)
DELAY
T
LF LEVEL
(Off to +6 dB)
CH. 1
LF OUT
(M3W:LF OUT)
(M3W:NOT USED)
HF OUT
CH. 1
(Off to +6 dB)
LF LEVEL
T
DELAY
(0-2 ms)
LF LEVEL
(Off to +6 dB)
CH. 2
LF OUT
(M3W:MF OUT)
LF LEVEL
(Off to +6 dB)
CH. 2
HF OUT
(M3W:HF OUT)
40 kHz
FILTER
HIGH
(6 dB/Octave)
(70 Hz-3.6 kHz)
FREQUENCY
(6 dB/octave)
HIGH
FILTER
40 kHz
CH. 2 LEVEL
(Off to +6 dB)
20 Hz
FILTER
LOW
(18 dB/octave)
CH. 1
(MONO SUB OUT)
(NOT USED IN
MONO SUB)
MUTE
+MONO SUB
CH. 2
INPUT
3 WAY
MONO
2 WAY
STEREO
CHANNEL
2
SUB
MONO
3
2
1
+
–
–
2
1
3
–
1
2
3
3
2
1
–
+
+
+
SUB
MONO
2
CHANNEL
3
2
1
3
2
1
MUTE
Block Diagram
MADE IN U.S.A.
RANE CORP.
ACN 001 345 482
LOW OUT CHANNEL 1 IN
MONO 3-WAY
MONO SUB OUT
LOW OUT
CLASS 2 EQUIPMENT
HIGH OUT STEREO 2-WAY
SUBWOOFER SWITCH MUST
BE SET TO 2-CHANNEL
FOR MONO 3-WAY
CHANNEL 2 IN LOW OUTHIGH OUT
2-
CHANNEL
SUBWOOFER
MONO SUB
OMIT MONO MONO 3-WAY
SYSTEM MODE
STEREO
2-WAY
OMIT MONO
MONO
3-WAY
OMIT FOR MONO SUB
MID OUTHIGH OUT
AC 22B
160mA
POWER
PIN 2=POSITIVE
PIN 3=NEGATIVE
PIN 1=CHASSIS GND
Mono 3-Way labels in this row.
High Amp
Mid Amp
Input
Low Amp
MADE IN U.S.A.
RANE CORP.
ACN 001 345 482
LOW OUT CHANNEL 1 IN
MONO 3-WAY
MONO SUB OUT
LOW OUT
CLASS 2 EQUIPMENT
HIGH OUT STEREO 2-WAY
SUBWOOFER SWITCH MUST
BE SET TO 2-CHANNEL
FOR MONO 3-WAY
CHANNEL 2 IN LOW OUTHIGH OUT
2-
CHANNEL
SUBWOOFER
MONO SUB
OMIT MONO MONO 3-WAY
SYSTEM MODE
STEREO
2-WAY
OMIT MONO
MONO
3-WAY
OMIT FOR MONO SUB
MID OUTHIGH OUT
AC 22B
160mA
POWER
PIN 2=POSITIVE
PIN 3=NEGATIVE
PIN 1=CHASSIS GND
Stereo 2-Way labels in this row.
High Amp
Right Input
Low Amp
Left Input
High Amp
Low Amp
Stereo 2-Way
Mono 3-Way

AC 22B
ACTIVE CROSSOVER
Data Sheet-4 All features & specifications subject to change without notice. DOC 106274
Rear Panel
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 TEL [phone] FAX [phone] WEB 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: A Primer,” RaneNote, (1983, 1989, 2005).
4. D. Bohn, “Why Not Wye?” RaneNote, (1984).
Available Accessories
• SC 1.7 Security Cover
Architectural Specifications
e active crossover shall contain 4th-order Linkwitz-Riley
filters. Provisions shall exist to correct for driver misalignment by
means of adding time delay to the low frequency outputs.
e 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 active balanced terminated
with XLR connectors. RFI filters shall be provided. Infrasonic
filters shall be built-in.
e active crossover shall afford an input level range of off
to +6 dB. e output level controls shall afford a level range of
from off to +12 dB with muting capability on the low frequency
outputs. e crossover shall supply two independent channels.
e unit shall be exempt from agency safety requirements
and powered from a UL listed, CSA certified remote power sup-
ply (120 VAC) or CE approved (230 VAC) via a rear panel input
modular plug. e unit shall be constructed entirely from cold-
rolled steel, and mount into a standard 1U EIA rack.
e unit shall be a Rane Corporation AC 22B Active Crossover.
Choosing the Right Configuration:
Mono, Two-Channel Mono or Stereo?
Very few systems indeed will utilize a two channel crossover
for the purpose of true stereo imaging. Discrete stereo chan-
nels 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 sig-
nificantly 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 3-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.
When all drivers in stacks are equal and acoustic differences
are not critical, delays are not required, and simplicity of use is
important, we recommend the Rane SAC 22 or SAC 23 Cross-
over.
MADE IN U.S.A.
RANE CORP.
ACN 001 345 482
LOW OUT CHANNEL 1 IN
MONO 3-WAY
MONO SUB OUT
LOW OUT
CLASS 2 EQUIPMENT
HIGH OUT STEREO 2-WAY
SUBWOOFER SWITCH MUST
BE SET TO 2-CHANNEL
FOR MONO 3-WAY
CHANNEL 2 IN LOW OUTHIGH OUT
2-
CHANNEL
SUBWOOFER
MONO SUB
OMIT MONO MONO 3-WAY
SYSTEM MODE
STEREO
2-WAY
OMIT MONO
MONO
3-WAY
OMIT FOR MONO SUB
MID OUTHIGH OUT
AC 22B
160mA
POWER
PIN 2=POSITIVE
PIN 3=NEGATIVE
PIN 1=CHASSIS GND