Dolby Laboratories CP500-300 Specifications Page 17

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SECTION 3
INSTALLATION AND JUMPERS
Do NOT connect the CP500 to mains power until all connections have been made
and all jumpers have been checked or set.
If air-conditioning noise is audible in the theater, arrange for lubrication of the
motor, fan bearings, adjustment of belts and drives, and cleaning of filters to reduce
the ambient noise to a minimum. If the air-conditioning cannot be repaired switch it
off while the CP500 is being aligned.
3.1 Replacing an Existing Sound System
If the CP500 replaces an existing cinema sound system, play a typical film before
you remove the old system so you will have a benchmark for comparison to the new
system. It can also serve as a check of the positioning of the exciter lamp, the
focusing of the soundtrack lens, and the condition of the solar cell.
3.1.1 Before playing the film:
Verify that the existing power amplifiers are in good working order.
Verify that the existing speakers are in good working order, and that
there is no loose or missing hardware, structural parts, or damaged
drivers in the enclosures.
Verify that all wiring is present and properly connected and that
crossovers are operating and are correctly adjusted.
Check the polarity of the speaker connections.
Verify that there are adequate earth (ground) connections.
Verify that radio interference problems are adequately resolved.
3.1.2 While playing the film:
While you run the film, listen carefully in various parts of the theater for audio
system problems:
Hum.
Noise, clicks, pops.
Distorted sound.
Poor tonal balance (lack of high-frequency or bass content).
These problems must be resolved before you can proceed with the new installation.
3.1.3 Disconnect the old system
Disconnect power from the existing cinema sound equipment.
Disconnect all cabling from the existing sound processor. Leave the
cables connected to the power amplifiers, booth monitor, etc.
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