Dolby
®
Model CP650 Installation Manual
B-Chain Alignment
4-6
Output Levels
>
>
>
>Channel: Center
Level: xx
Room Level xx.x dB
Adjust Output Level
Channel: Center
> Level: xx
Room Level 85.0
85.0
85.0
85.0 dB
Output Levels
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.
menu
OK
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.
