User`s manual

Dolby
®
CP650 Digital Cinema Processor User’s Manual Operating Instructions
2-7
Format Selection
Select the desired film soundtrack format or your nonsync source by pressing the
appropriate front-panel button. The button illuminates and the format number appears
on the screen to confirm that the format was selected. Common formats are:
• 01 Mono—For all optical prints of any vintage with conventional mono optical
(Academy) soundtracks.
• 04 Dolby A-type—For Dolby releases, except those marked SR or Digital.
• 05 Dolby SR—For releases marked as having a Dolby SR (Spectral Recording)
soundtrack or for Dolby Digital prints if your CP650 is not equipped with digital
playback capability.
• 10 Dolby Digital—For Dolby Digital film releases. The digital data is clearly
visible between the film perforations next to the analog soundtrack. (Your CP650
must be equipped with a Cat. No. 773 board.)
• 11 External 6ch—For selecting an external six-channel analog sound source.
• 13 Dolby Digital Surround EX.
• NS nonsync—Usually format 60. For playing an intermission music tape or CD.
The film-soundtrack format numbers used on the CP650 buttons (and also on models
CP45, CP65, and CP500) often appear on the film can and leader. If these numbers
are not supplied and you are not sure if a print is mono, stereo optical, or digital, see
Appendix C, which explains how to identify the various types of soundtracks.
2.2.2 Main Fader
The main front-panel fader knob on the CP650 controls the volume level in the
theatre. It works in both normal and bypass operation. When the CP650 has been
correctly installed, setting the fader to 7.0 plays the film at the level at which it was
mixed. This is the proper level for any film encoded with Dolby technologies.
Although a minor adjustment in playback level might be required under unusual
circumstances, avoid significant deviations from the correct level (7.0) established by
the installer. If the playback level is set too low, dialogue may be hard to understand;
too high a level may cause complaints from the audience, and under extreme
circumstances, can damage the theatre’s sound system.