Dolby Laboratories CP650 Installation Manual download pdf (Page 58)

Dolby

Model CP650 Installation Manual B-Chain Alignment

4-6

eve

>Channel: Center

Level: xx

Room Level xx.x dB

Adj

eve

Channel: Center

> Level: xx

Room Level 85.0

85.085.0

85.0 dB

eve

Channel: Center

>Level: xx

Room Level xx.x dB

4.5 Initial Output-Level Calibration

Each of the channels should now be adjusted to give a reasonable sound pressure

level in the room. It is not necessary to get exact readings at this point because the

levels will change slightly during equalization of the room. Exact output level

adjustment will be performed after equalization.

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.

4.5.1 Main Channels

After auto-calibration, the Output Levels adjust

screen appears with Center Channel active.

Note: The RTA oscilloscope display is not active on this menu.

Press the center menu button, moving the cursor

down one line to Level:

Note: The Level: line on the display shows a relative number.

The number has no units.

Rotate the main fader knob to change the CP650

pink-noise output signal level into the auditorium

while watching the measured Room Level shown

on the bottom line of the display. Set it to 85 dB.

Note: If the room level does not appear, the calibration step may

have failed or was not performed. Repeat Section 4.4.

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Dolby Laboratories CP650 Installation Manual Page 58