Dolby CP750 Digital Cinema Processor Manual - Projectionniste.net

Initial Setup
5.3 Initial Setup
Prepare for the alignment process with the following steps:
1. Set all the gain controls on all power amplifiers to known, repeatable settings. The
preferred setting for most amplifier gain controls is the maximum. If a different
setting is required in order to optimize the noise performance of the system, the
controls should be locked in position or marked clearly.
Caution: The following process causes the CP750 to output pink noise to the power
amplifiers.
The CP750 output levels may be set too high. If you are unsure of the settings on
your unit, turn off the power amplifiers before calibrating SPL. Then, select and
observe the present output level adjustment settings.
2. Set up your crossovers if present.
3. Apply power to the CP750.
4. Launch the CP750 Setup Software, connect to the unit, and click Alignment.
The software displays a warning that entering alignment mode will disturb
auditorium audio.
5. Click Continue in the warning tab that appears to begin the auditorium alignment
process.
The Room Levels tab appears active.
Room Levels shows a summary of current settings, allows you to calibrate the internal SPL
meter, allows you to choose a channel with which to work, or to adjust any channel’s level
with a slider. Each increment of the displayed relative number from a value of 1 to 127,
represents an increment of approximately 0.25 dB of range adjustment.
Figure 5‐2 shows an example of the tab before the SPL is calibrated.
Dolby ® CP750 Digital Cinema Processor Manual 37