Rane CP 31 User Manual

Page 4

Manual-4

RECOMMENDED CALIBRATION PROCEDURE

The CP 31 is a versatile instrument. While this allows it to conform to the requirements of a number of system applications,

it also results in complexity. For this reason, it is very important to use an organized approach to system calibration. Once the
system is connected and the internal switches set for your specific application, take the time for proper calibration. The
following is an ordered list of system adjustments that makes calibration easy, and results in optimum performance.

This procedure assumes that a microphone is used for the Page. The procedure (except for the exact wording) is the same

for other Page sources (e.g., telephone, etc.).

See the Internal Pre/Post Zone Switches note on page Manual-3 before installing the unit.

Make sure the POWER is off!

PREFLIGHT CONTROL SETTINGS

PAGE SETTINGS:
• MIC/LINE Pad

As required

(front panel)

• Gain TRIM

12:00 (center)

(front panel)

• DETECT THRESHOLD

Min (ccw, Active)

(front panel)

• Paging LEVEL A & B

Min

(front panel)

• PAGING ASSIGN

BOTH

(front panel)

• HIGH/LOW CUT FILTER

As required

(rear panel)

PROGRAM INPUT SETTINGS:
• Input Levels

Min

(front panel)

ZONE SETTINGS:
• DUCKER DEPTH

2:00 (about 15 dB)

(front panel)

• DUCKER OFF/ON

OFF

(front panel)

• Zone LEVEL A & B

Max

(front panel)

• Zone Output MONO

As required

(rear panel)

• Zone Expand PROGRAM/PAGE

As required

(rear panel)

• Expand Output LEVEL

As required

(rear panel)

SYSTEM CONNECTIONS
• Connect page microphone or line-level paging source
• Connect Program source(s)
• Connect Output(s) to amplifier(s) or destination(s)

CALIBRATION
1. Connect the RS 1 power supply and verify the Power indicator lights.

2. Verify the Zone LEVEL controls are set to maximum and that an active source is playing to the Program Inputs. Adjust the

PROGRAM INPUT LEVELS to be the very loudest you would ever desire.

3. Adjust the Zone LEVEL control to a comfortable listening level.

4. Note that with the Paging LEVEL set to minimum, the following Page will not be heard. Speak very loudly (bark) into the

Paging mic. Adjust the Paging TRIM control so that the Paging Overload indicator just lights. It is important to set the gain
of the pre-amp before setting the Paging Detect Threshold.

5. Speak into the Paging mic in a normal voice and adjust the Paging DETECT THRESHOLD so the ACTIVE indicator lights

only during speech. If the Paging DETECT THRESHOLD is set too low, the Pager may gate on due to background sound.

6. With a Program source playing, speak into the Paging mic. Adjust the Paging LEVEL control to provide the correct Page-to-

Program mix. If the Paging DETECT THRESHOLD is set too high, there may be a delay before speech is heard. To correct
this, lower the Paging DETECT THRESHOLD setting.

7. Set the DUCKER switches to ON. With a Program source playing, speak into the Page mic and adjust the DUCKER DEPTH

to the desired level of Program during a Page.

You’re all set. Enjoy.

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