Dolby Laboratories CP650, Руководство по установке

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Dolby
®
Model CP650 Installation Manual B-Chain Alignment
4-25
Output Levels
>
> > >Channel: Center
Level: xx
Room Level xx.x dB
Digital Subwoofer Digital Subwoofer Digital Subwoofer Digital Subwoofer
> > > >Level: xx
Polarity: Normal
Center Noise: Off
Digital Subwoofer
>Level:
>Level: >Level:
>Level: xx
Polarity: Normal
Center Noise: Off
Saving Changes.....
...
4.7.6 Final Output-Level Calibration
Now that room equalization is complete, the sound pressure level in the theatre can be
set accurately.
Main Channels
MIC 1
If a microphone multiplexer is being used,
select MIC 1.
menu
OK
L, C, R = 85 dB
Ls and Rs = 82 dB or
Ls, Bsl, Bsr, Rs = 82 dB
Press the left menu button to display the Output
Levels screen.
Repeat the output level setting steps given in
Section 4.5.1, starting with the second step in that
section.
Note: Since the sound pressure level calibration was performed
earlier, a recalibration is not required unless the microphone
placement has changed. Repeat the steps in Section 4.4 if
necessary.
Digital Subwoofer Channel
Switch the microphone multiplexer to cycle.
Press the left menu button once to move the
display one menu step to
Digital Subwoofer
Level .
Note: The RTA oscilloscope display is active on this menu. If
the reference line does not appear, the calibration step may have
failed or was not performed. Repeat the SPL steps in Section 4.4.
Pink noise is now present on the subwoofer
channel only (100 Hz bandwidth).
Using the front-panel knob, adjust the subwoofer
channel by moving the average subwoofer RTA
display to the reference line displayed on the
scope.
OK
Press the right-hand
OK button to save the final
level setting.