Rane CP 31 User Manual
OPERATORS MANUAL CP 31
COMMERCIAL PROCESSOR
QUICK START
If you were the type that cheated on school book reports by just skimming through the reading assignments, then this
section is for you! It gives you not quite enough information to really know what you’re doing. But, if you follow the
recommended set up procedure, you should get at least a “B.” This thing is pretty easy to set up…a “C” will pass.
Keep the amplifiers and the CP 31 turned off until all connections are made. The unit does not ground the chassis
through the power cord. It is important that the unit be grounded (required by law in most installations).
PAGE INPUT: Connect the PAGING INPUT to the Euroblock on the rear panel. On the front, select the appropriate MIC
or LINE switch position. Then set the gain with the PAGING TRIM control, then set the PAGING DETECT THRESH-
OLD and finally the PAGING LEVEL. Set the HIGH/LOW CUT FILTER switch located on the rear panel as desired.
PROGRAM INPUTS: Connect line level program sources to the RCA PROGRAM INPUT jacks and engage the MONO
switch if desired. Set the PROGRAM INPUT LEVELS.
EXPAND OUTPUT: Wire the EXPAND Output Euroblock as required to a mono feed delivering PAGE-only or PRO-
GRAM-only signal, depending on the rear panel switch setting. This Output uses a line driver that may be used balanced or
unbalanced. Adjust the EXPAND LEVEL trim as desired.
DUCKER: With the DUCKER switches ON, and a Program source playing, speak into the mic and adjust the DUCKER
DEPTH to control the Program level during a page. Program will return to its previous volume after the page has finished.
ZONE OUTPUT: The ZONE OUTPUT uses a line driver that may be used balanced or unbalanced. Set the LEVEL
control as required.
A highly recommended setup procedure appears on page Manual-4. By following it you will encounter fewer problems
and reduce the need to increase our collective phone bills.
CAUTION: Never connect anything except an approved Rane Power supply to the thing that looks like a red telephone jack on the rear of the CP 31. This is an 18 VAC center tapped power input. Consult the Rane factory for replacement.
CP 31 CONNECTION
Be sure the power is OFF until all connections are made.
EUROBLOCK CONNECTIONS
All Input and Output connections are made with Euroblock connectors except for the RCA Program Inputs. When
wiring to Euroblocks, a minimum wire gauge of 22 AWG is
preferred for reliability. If the ground or shield wire is left
shorter, it acts as a strain relief for the other wires. Cable with
a flexible jacket is easier to use and less likely to damage the
connections. Avoid stripping excess insulation. Inspect wires
for nicks that may lead to wire breakage. Fully insert each
wire in the appropriate socket and tighten the screw.
The Page Input circuit is a true instrumentation amplifier
and operates balanced or unbalanced. Expand and Zone
Outputs are balanced line drivers. Wiring is usually the same
for both Inputs and Outputs. Balanced operation is highly
recommended. Balanced wiring is straight forward, (+) to (+),
WEAR PARTS: This product contains no wear parts.
(–) to (–) and shield to shield.
For unbalanced operation, use single conductor cable with
shield. Connect (+) to (+) and the shield/ground wires to the
shields at both ends. Do not connect the (–) pin. When
unbalanced wiring is used, it is very important for the CP 31
and any other unit in the system to have good earth or
technical grounds. If a unit is located far from the CP 31
(greater than ten feet) or is of a type that might create grounding problems, use isolation transformers.
Refer to the included RaneNote 110, “Sound System
Interconnection” for more information on proper wiring
procedures.
PROGRAM INPUTS
The stereo or dual-mono Program Inputs connect to RCA
jacks. These Inputs are unbalanced. The same guidelines
given above for unbalanced operation apply to these Inputs.
Manual-1
CP 31 - FRONT PANEL
PAGING TRIM control is used to adjust the Page Input preamplifier gain to match the microphone/source in use, not to set
the Page level at the Zone Output. The range is 30 dB to 60 dB.
PAGING MIC/LINE switch selects a 30 dB Input pad when set to LINE.
PAGING DETECT THRESHOLD sets the Page signal level required to gate a Page on and illuminate the ACTIVE
indicator (#5). The range is -∞ (on) to +4 dBu.
PAGING OL (Overload) indicator lights when the Page Input preamplifier comes within 4 dB of clipping.
ACTIVE indicator lights when the Page signal level reaches the Paging Detect Threshold. Note that a Page is always Active
when the PAGING DETECT THRESHOLD is set to minimum (ccw).
PAGING ASSIGN switch selects whether the Page signal is sent to Zone A, Zone B, BOTH Zones, or OFF (no Zones).
PAGING LEVEL controls adjust the Paging Level in each of the two (A & B) Zones.
PROGRAM INPUT LEVEL controls allow independent level adjustment for the stereo or dual mono Program Input(s).
ZONE DUCKER DEPTH control sets the Ducker Depth (the amount of Program attenuation during a Page) from 50 dB
(ccw) to 6 dB (cw). The Ducker release is ramped and not user-adjustable.
ZONE DUCKER OFF/ON switches independently turn each Ducker ON or OFF.
ZONE Output Meter displays PEAK signal levels at -10 dBu, +4 dBu, and +16 dBu.
ZONE LEVEL controls adjust the overall Level for each Zone Output. This concentric pot allows independent adjustment
of Output Levels, or “stereo/master” level control by holding both the inner and outer knobs together.
PWR indicator lights when the CP 31 is connected to a powered RS 1 power supply.
Manual-2
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