OPERATORS MANUAL
AC 22B
ACTIVE CROSSOVER
QUICK START
The AC 22B can be either a Stereo 2-Way or Mono 3-Way crossover. Labels above the controls refer to the unit being
operated in the 2-Way Stereo mode. Labels below the controls refer to the unit being operated in the 3-Way Mono mode.
The AC 22B is a fully balanced output version of the popular AC 22 and is equipped with XLR conectors instead of
the standard ¼" TRS jacks. All other features, specifications and operation are identical with the standard model with an
added switch. Where the AC 22 is configured somewhat automatically by using switching jacks, the AC 22B is configured by a SYSTEM MODE switch added to the back of the unit.
To operate the AC 22B in Stereo 2-Way mode, be sure that the Mode switch is set for STEREO 2-WAY. Follow the
labels above the controls and jacks.
When operated in the Mono 3-Way mode, the switch should be set in the MONO 3-WAY position. Follow the labels
below the controls and jacks. In Mono 3-Way mode the Channel 1 High Output is unusable. This output is the high-passonly portion of the midrange filter. The Channel 1 High Level and the Channel 2 Master Level are also defeated on the
front panel.
NEVER CONNECT ANYTHING EXCEPT AN RS 1 OR OTHER APPROVED RANE AC POWER SUPPLY
TO THE THING THAT LOOKS LIKE A TELEPHONE JACK ON THE REAR. This is an AC supply and requires
some special attention if you do not have an operational power supply EXACTLY like the one that was originally
packed with your unit.
AC 22B CONNECTION
In agreement with IEC and AES/ANSI standards, AC 22B
wiring convention is pin 2 Positive, pin 3 Negative (return),
pin 1 Signal ground (for unbalanced use), with the connector
case or shell tied to chassis ground.
BALANCED OPERATION
Use only when driving from a true balanced source and
driving to a true balanced destination—either transformer
coupled or active drive. Connect the input to pins 2 and 3
with pin 2 positive. Do not connect pin 1. Terminate the
shield to the case or shell. Connect the output to pins 2 and 3
with pin 2 positive. Do not connect pin 1. Connect the shield
to the case or shell.
WEAR PARTS: This product contains no wear parts.
UNBALANCED OPERATION
Connect the input between pins 2 and 1 with pin 2 positive
and pin 1 Signal ground. Short pin 3 to pin 1. Terminate the
shield to the case or shell. Connect the output between pins 2
and 1 with pin 2 Positive. Leave pin 3 open—do not short it
to pin 1. Connect the shield to the case or shell.
COMBINATION OPERATION
For combined balanced and unbalanced operation, use
whichever half of the above instructions apply for each end.
See the “Sound System Interconnection” RaneNote
included with this manual for more information on cabling
and grounding requirements.
Manual-1
FRONT PANEL: STEREO 2-WAY CONFIGURATION
Observe the labels screened above the controls for stereo operation.
POWER switch: Self-evident.
POWER indicator: When this yellow LED is lit the unit is ready to operate.
CHANNEL 1 MASTER LEVEL controls the overall Level of Channel 1 without altering the relative settings of the HIGH
and LOW Outputs. Unity gain for all LEVEL controls is at “7”.
LOW LEVEL controls the Level of signal going to the LOW Output in this Channel. In the MONO SUB mode the Channel
1 LEVEL control sets the Level of the MONO SUB Output, Channel 2's LEVEL control is inactive.
LOW MUTE: When pressed to the in position, all signal is removed from the LOW Output. This eases tune-up procedures,
as described on pages Manual-7 through 13. In the MONO SUB mode, the Channel 1 LOW MUTE switch mutes the
MONO SUB Output, Channel 2's MUTE is inactive.
LOW TIME DELAY control adds from 0 to 2 ms of time Delay to the LOW OUT only. This allows a low frequency driver
to be electronically phase-aligned with a high frequency driver whose diaphragm is situated behind the low frequency
diaphragm. Refer to Time Delay Adjustment on page Manual-6. NOTE: Both DELAY controls are inactive in the MONO
SUB mode.
LOW/HIGH FREQUENCY: This 41-detent selector determines the crossover Frequency between the LOW and HIGH
Outputs. The detents assure maximum accuracy and consistency between Channels. Refer to Selecting Crossover Frequen-
cies on page Manual-6 to determine the proper setting for your particular system.
HIGH LEVEL controls the Level of signal going to the HIGH Output in this Channel.
CHANNEL 2 MASTER LEVEL controls the overall Level of Channel 2 without altering relative settings of the HIGH and
LOW Outputs.
Manual-2
REAR PANEL: STEREO 2-WAY CONFIGURATION
Observe the labels screened above the Inputs and Outputs for stereo operation.
CHANNEL 1 INPUT connects to the left channel output of the mixer, equalizer or other source.
CHANNEL 2 INPUT connects to the right channel output of the mixer, equalizer or other source.
HIGH FREQUENCY OUTPUTS: Connect Channel 1 HF OUT to the left channel input of the high frequency amp, and
the Channel 2 HF OUT to the right channel input of the high frequency amp.
LOW FREQUENCY OUTPUTS: Connect the Channel 1 LF OUT to the left channel input of the low frequency amp and
the Channel 2 LF OUT to the right channel input of the low frequency amp. For Mono Subwoofer applications use Channel
1 LF OUT. Channel 2 LF OUT is disconnected in MONO SUB mode (see #8 below).
SUBWOOFER switch disconnects the Output from Channel 2 LF OUT and sums it with Channel 1 LF OUT. The result is
taken from Channel 1 LF OUT.
SYSTEM MODE switch: Set this switch for STEREO 2-WAY operation.
POWER input connector: Use only an RS 1, or other remote AC power supply approved by Rane. This unit is supplied
with a remote power supply for connection to this input jack. Consult the factory for replacement or substitution. This unit’s
power input is designed for an AC supply, delivering 18-24 volts, from a center-tapped transformer capable of supplying at
least the current demanded by this product. Using any other type of supply may damage the unit and void the warranty. The
Rane RAP 10 power supply can power up to ten Rane units that use outboard supplies.
Chassis ground point: A #6-32 screw is supplied for chassis grounding purposes. Units with external power supplies do
not ground the chassis through the line cord. In case of a grounding problem, try connecting crossover chassis ground to
amplifier chassis ground or directly to the grounding screw on a grounded AC outlet cover by means of a wire secured on
both ends with star washers to guarantee proper contact.See the Chassis Grounding Note below.
IMPORTANT NOTE
CHASSIS GROUNDING
If after hooking up your system it exhibits excessive hum or buzzing, there is an incompatibility in the grounding
configuration between units somewhere. Your mission, should you accept it, is to discover how your particular system
wants to be grounded. Here are some things to try:
1. If your equipment is in a rack, verify that all chassis are tied to a good earth ground, either through the line cord ground-
ing pin or the rack screws to another grounded chassis.
2. Units with outboard power supplies do not ground the chassis through the line cord. Make sure that these units are
grounded either to another chassis which is earth grounded such as an amplifer, or directly to the grounding screw on an
AC outlet cover by means of a wire connected to the grounding screw on the chassis.
3. Try moving the device away from high magnetic field sources, such as large transformers used in power amplifiers.
4. Be sure of properly balanced inputs and outputs. Connect balanced devices with balanced connectors and cables. Runs
longer than 10 feet require balanced interconnect.
Please refer to RaneNote “Sound System Interconection” for more information on system grounding and balanced/
unbalanced connections.
Manual-3
FRONT PANEL: MONO 3-WAY CONFIGURATION
Observe the labels below the controls for Mono operation.
POWER switch: Self-evident.
POWER indicator: When this yellow LED is lit, the unit is ready to operate.
CHANNEL 1 MASTER LEVEL controls the overall Level without altering the relative settings of the HIGH, MID and
LOW Outputs. Unity gain for all Level controls is at “7”.
LOW LEVEL controls the Level of signal going to the LOW Output.
LOW MUTE: When pressed to the in position, all signal is removed from the LOW Output. This eases tune-up procedure,
as described on pages Manual 7-13.
LOW DELAY control adds from 0 to 2 ms of time Delay to the LOW Output only. This allows a low frequency driver to
be electronically phase-aligned with a high frequency driver whose diaphragm is situated behind the low frequency diaphragm. Refer to Time Delay Adjustment on page Manual-6 for the procedure.
LOW/MID FREQUENCY: This 41-detent selector determines the crossover Frequency between LOW and MID Outputs.
The detents will assure maximum accuracy and consistency between Channels. Refer to Selecting Crossover Frequencies
on page Manual-6 to determine proper setting for your particular system.
MID LEVEL controls the Level of signal going to the MID Output.
* NOTE: The Channel 2 MASTER LEVEL control is automatically bypassed internally when the System Mode switch is set to
MONO 3-WAY as shown on the facing page. Adjusting this control will have no effect in the MONO mode.
MID MUTE: When pressed to the in position, all signal is removed from the MID Output. This eases tune-up procedures,
as described in pages Manual 7-13.
MID DELAY control adds from 0 to 2 ms of time Delay to the MID Output only. This allows a mid frequency driver to be
electronically phase-aligned with a high frequency driver whose diaphragm is situated behind the mid frequency diaphragm.
Refer to Time Delay Alignment on page Manual-6 for procedure.
MID/HI FREQUENCY sets the crossover Frequency between the MID and HIGH Outputs. Refer to Selecting Crossover
Frequencies on page Manual-6.
HIGH LEVEL controls the Level of signal going to the HIGH Output only.
Manual-4