Installation manual

DTS-6 Installation Manual Section 7: Diagrams
7-36
Dual Projector Theaters
Guide For A Seamless Change-Over
Occasionally, when running a DTS movie with dual projectors, you may come across situations
when the picture and sound are not changing in unison during a change over. This is due to the
fact that as soon as the first frame of action reaches the picture aperture on the incoming
projector, the DTS digital sound will change over to that reel. DTS digital sound changes
independent of the projector’s dowser position. Change over anomalies are most evident on
movies that have very tight editing / scene change tolerances from one reel’s end to the next
reel’s start.
Since every brand of projector has variances (speed, for example), you may come across
occasions when, during a change-over, the picture and sound are not changing at the same time.
When this occurs, do the steps below.
Sound changes before picture
When threading the incoming projector, roll down the film to a greater number of feet. If you
normally thread to “8", try threading to “9" or “10”. Keep adjusting the roll down setting until the
picture changes with the sound. Also, try hesitating a second before
starting the incoming
projector
on the first cue.
Picture changes before sound
When threading the incoming projector, roll down the film to a lesser number of feet. If you
normally thread to “8", try threading to “7” or “6". Keep adjusting the roll down setting until the
picture changes with the sound. Be sure to hesitate opening the dowser on the incoming projector
(on the second cue) until the last word on the outgoing reel is heard on screen.
Determining roll-down
Adjusting the roll down setting is a judgment call. Base it on the time delay of picture vs. sound.
One second of delay equates to 24 frames, or 1.5 feet.
For further information, please contact DTS at [phone].
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