Page 1
DATA SHEET
General Description
The CP 31 is a single-page, single-zone stereo or dualmono commercial preamplifier for the small restaurant,
lounge, retail boutique, small office or manufacturing facility.
System designers now have three choices in Commercial
Processors from Rane to fulfill their paging needs – the CP 31
and its bigger brothers the CP 52 & CP 64.
The CP 31 provides Page Ducking for its single stereo
Program Input. One stereo or two completely independent
mono Zones are served. The Page signal can be independently
assigned to either of the two Outputs.
The Paging Input section includes a balanced Euroblock
Input connector, Mic/Line switch, Trim control, ganged/
switchable High/Low Cut Filters (fixed at 100 Hz & 7 kHz),
gating with adjustable Detect Threshold, Active and Overload
LEDs, Page Assign (Off, A, B or Both) and independent Page
Levels for the two Outputs, A & B. The Page signal is
summed “post-zone level” as shipped from the factory, so
Paging levels remain independent of the Zone Output Level.
CP 31
COMMERCIAL PROCESSOR
Internal Paging Pre/Post Zone Level switches allow the
Paging signal to be summed pre-Zone Level for mic/line
mixing.
The Program Input section includes a stereo RCA (unbal-
anced) Input, Mono switch, and Level trims.
The Zone Output section features adjustable Ducker
Depth with an On/Off switch independent for each program
input. The Zone Outputs have independent front panel Level
controls and 3 segment level meters.
The Expand output allows Page or mono Program signals
to feed an additional location or device for system expansion.
The Expand Output has its own rear panel Level trim.
The CP 31 is the least complex and least expensive of
Rane’s Paging products which include the CP 52 and CP 64.
The CP 31 is also perfect for zone expansion of Rane CPbased systems. Simply connect the CP 52 or CP 64 Page or
Program Expand Outputs to a CP 31 to add an extra Zone
(with its own page, program, both or neither).
Gated Paging Circuit Features
• Mic/Line Selection with Gain Trim
• High and Low Cut Filter Switch
• Adjustable Detector Threshold with Active LED
• Independent Paging Level Controls
Zone Output Features
• Level Control
• Ducker On/Off with Depth Control
Special Features
• Page Initiated Program Ducking
• Page/Program Expansion with Level Control
• UL/CSA/CE and 100/120/230 VAC Remote Power Supplies
Data Sheet-1
Page 2
CP 31
COMMERCIAL PROCESSOR
Features and Specifications
Parameter Specification Limit Units Conditions/Comments
MIC/LINE PAGING INPUT
..........Input Type Balanced Instrumentation amplifier
..........RFI Filter Yes
..........Gain Range +30 to +60 2 dB Continuously adjustable
..........Frequency Response 30 to 40k typ Hz Maximum gain, +0, -3 dB
..........Input Referred Noise -125 1 dBu Gain: 60 dB, Rs:150 ohms, BW: 20 kHz
..........CMRR 40 min dB 20 Hz to 20 kHz
..........THD+N 0.05 0.01 % Gain: 30 dB, +4 dBu out, 1 kHz, BW: 80 kHz
..........“Mic” Input Impedance 500 1% ohms Each leg to ground
..........Line Pad 30 1 dB
..........“Line” Input Impedance 14.5k 1% ohms Each leg to ground
..........Signal Detector Range -
..........Signal Detector Attack 10 typ msec Fixed; 10 dB overdrive
..........Signal Detector Release 3 typ sec Fixed
..........Overload Detector +16 1 dBu 4 dB before clipping
..........Low Cut / Hi Cut Filters 100 & 7k 5% Hz Selectable In/Out
PROGRAM INPUT
..........Input Type Unbalanced RCA connector
..........Input Level Adjust Off to 0 dB
..........Frequency Response 10 to 50k typ Hz +0, -3 dB
..........Input Impedance 10k 1% ohms
OUTPUTS
..........Type Balanced Euroblock connector
..........Zone Out Gain: Program In 12 1 dB
...............From Page Inputs 6 1 dB
..........Expand Out Gain 6 1 dB From Page or Program Input
..........Frequency Response 10 to 50k typ Hz +0, -3 dB
..........S/N 90 min dBr re +4 dBu; BW: 20 Hz-20 kHz
..........THD+N 0.05 0.01 % +4 dBu, 1 kHz, BW: 80 kHz
..........Crosstalk -80 max dB 1 kHz, Rs: 25 ohms, (L/R)
..........Output Impedance 100 1% ohms Each leg
..........Maximum Output 24 typ dBu Load: 2k ohms
..........Peak Meter -10, +4, +16 ±2 dBu Peak reponse
..........Ducker: Depth Range 50 to 6 typ dB Continuously adjustable
(on) to +4 typ dBu Continuously adjustable
Stereo
Exposure to modulated RF and electromagnetic fields as specified in CE EMC standard EN55103-2 results in worst case
THD+N of 0.34% (quasi-peak, A-weighted, 22-22k Hz) with a signal level of +4 dBu @ 1k Hz.
Data Sheet-2
Page 3
CP 31 Block Diagram
CP 31
COMMERCIAL PROCESSOR
PAGING INPUT
+
-
LEFT
PROGRAM INPUTS
RIGHT
MONO
30 dB
PAD
PAGE
OVERLOAD
TRIM
30 to 60 dB
LINEMIC
PAGE DETECT THRESHOLD
A DUCKER DEPTH
6 dB60 dB
LEFT
PROGRAM
LEVEL
RIGHT
PROGRAM
LEVEL
DUCKER
MONO PROGRAM
B DUCKER DEPTH
DUCKER
+6 dB
6 dB60 dB
+6 dB
ACTIVE
+4 dBuON
HIGH / LOW
CUT FILTER
100 Hz 7k Hz
PAGE ASSIGN
A DUCKER
ON OFF
B DUCKER
ON OFF
OUT
IN
B
A
PAGE
LEVEL
A
PAGE
LEVEL
B
INTERNAL CONTROL
*
MONO PROGRAM
*
POST
PRE
*
POST
PRE
BAZONE
PAGE
EXPAND
LEVEL
PROGRAM
A
LEVEL
B
+6 dB
+6 dB
+6 dB
EXPAND
OUTPUT
dBu
+16
+4
-10
ZONE
OUTPUT
+
-
-
+
dBu
+16
+4
-10
+
-
A
B
Parameter Specification Limit Units Conditions/Comments
UNIT: Agency Listing
..........120 VAC model Class 2 Equipment National Electrical Code
UL Exempt Class 2 equipment
CSA Exempt Class 2 equipment
..........230 VAC model CE-EMC EMC directive 89/336/EEC
CE-Safety Exempt per Article 1 of LVD 73/23/EEC
POWER SUPPLY: Agency Listing
..........120 VAC model UL File No. E88261
..........230 VAC model CE-EMC EMC Directive 89/336/EEC
Power Supply Requirements 18 VAC w/ center tap 10% Vrms
Maximum Current 750 mA RMS current from remote supply
UNIT: Construction All Steel
..........Size 1.75" H x 19" W x 8.5" D 1U (4.4 cm x 48.3 cm x 21.6 cm)
..........Weight 5 lb (w/o power supply) (2.3 kg)
SHIPPING: Size
..........Weight 9 lb (4.1 kg)
Note: 0 dBu = 0.775 Vrms
RS 1 (see data sheet) Class 2 Equipment
CSA File No. LR58948
CE-Safety LV Directive 73/23/EEC
4.5" x 20.3" x 13.75" (11.5 cm x 52 cm x 35 cm)
Data Sheet-3
Page 4
CP 31
COMMERCIAL PROCESSOR
Rear Panel and Example System Diagram
Architectural Specifications
The CP 31 Processor shall provide a gated paging input
and two line-level program inputs. One stereo zone with a
balanced output shall be served. A port with independent
level control shall be provided for mono expansion of page or
program signals.
The page input shall use a 3-pin Euroblock connector.
Fully adjustable paging controls shall include page Level, 30
dB mic/line input pad plus 30 dB gain trim, detect threshold
control, and a high/low cut filter switch.
The program input shall have stereo RCA jacks, independent level controls, and a mono switch.
Zone outputs shall use a 5-pin Euroblock connector. Zone
controls shall include a switchable ducker with depth control,
independent fpr Zone outputs A and B.
The unit shall be exempt from agency safety requirements
and powered from a Rane RS1, UL listed, CSA certified
remote power supply (meeting CE-EMC requirements for 230
VAC). The chassis shall be constructed entirely from coldrolled steel, and mount into a standard EIA relay rack
occupying one rack space. Reliability and efficiency are to be
primary design considerations.
The unit shall be a Rane Corporation CP 31 Commercial
Processor.
Available Accessories
• SC 1.7 Security Cover (full front panel)
©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 103137 PN 09564 7-99
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