INTRODUCTION
This manual contains essential information on the installation and alignment of the Dolby
Model DA20 Digital Film Sound Processor. It is designed to operate with one of Dolby
Laboratories’ model CP500, CP200, CP65, CP55, or CP45 Cinema Processors to allow
decoding and correct playback of the Dolby Digital optical soundtrack format.
The components of the system are:
Model DA20 SR•D Digital Film Sound Processor
The rack-mounted electronic chassis containing the necessary electronics to drive one or
two Cat. 700 Digital Soundheads, and decode the scanned digital soundtrack into 5.1
channels of high quality audio.
The Cat. No. 700 Digital Soundhead
The soundhead is a film-driven mechanical film transport assembly that provides a stable
film path with a light source, optics, and a CCD (Charge Coupled Device) array. These
components are used to scan digital data from a Dolby Digital print.
The Cat. No. 700 is shipped with a standard 10 meter video cable and a self-contained
Exciter Lamp Power Supply. One Cat. No. 700 is standard with each system; a second
Cat. No. 700 may be purchased for systems requiring changeover.
DA20-to-Cinema Processor Interface Kit
These interface cables connect format control and audio signals from the DA20 to the
Cinema Processor. Some Cinema Processor types require upgrading to take full
advantage of all digital channels produced by the DA20.
About this manual
This manual is intended to be used by individuals who are qualified in the area of cinema
sound installation and service. The basic day-to-day operation of the DA20 is covered in
the DA20 Users’ Manual.
This installation and alignment manual covers the procedures necessary to ensure that
the theatre sound system is accurately aligned to standards that have been established by
Dolby Laboratories. Following these procedures will ensure that the theatre sound
system will accurately reproduce the soundtrack as director and sound mixers intended.
The DA20 Digital Film Sound Processor and Cat. No. 700 Digital Soundhead work
together with Dolby Cinema Processors CP500, CP200, CP65, CP55 or CP45 to provide
the best possible signal to the cinema sound system. The projector, the Dolby processor,
the power amplifiers and the loudspeakers, as well as the auditorium itself, must be
considered when aligning the system for optimum performance. Refer to the appropriate
Cinema Processor manual for alignment instructions for the A and B chains.
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