Installation manual

Dolby

Model CP650 Installation Manual B-Chain Alignment

4-4

lib

SPL

Enter Room Reading:

> xx.x dB

Press OK to continue

rossover

Full Range

Crossover Disabled

4.4 SPL (Sound Pressure Level) Calibration

If your CP650 is equipped with a Cat. No. 791 Crossover Board, an initial setup is

required before you begin the SPL calibration. If you do not have a Cat. No. 791

installed, skip to Section 4.4.2.

4.4.1 Initial Setup (CP650s with Cat. No. 791 Crossover)

SPL calibration of CP650s equipped with a Cat. No. 791 Crossover Board is

performed with the crossover set to “Full Range” mode. Pink noise is applied only to

the CP650 low-frequency (LF) main outputs and these outputs are switched to full-

frequency operation for calibrating the CP650 to the room sound pressure level.

Press the left menu button four times to display

the Crossover Mode screen.

One of three crossover configuration choices is

displayed on the second line: Full Range, 2-Way,

or 3-Way.

Rotate the front-panel knob until Full Range is

displayed.

Press OK to save this setting.

4.4.2 Calibration Procedure (All CP650s)

Press the left menu button twice to move the

display to the Calibrate SPL menu item.

Pink noise is sent to the center channel speaker.

Note: If pink noise is not being generated, this indicates that the

status of the digital input has changed. If you are using the digital

input on the CP650, either disconnect or power down the device

attached the digital input during calibration. A change in the

digital input bitstream will cause the CP650 to mute the pink

noise.