Dolby Laboratories CP650 User Manual download pdf (Page 35)

Dolby

CP650 Digital Cinema Processor User’s Manual

A-1

Auditorium Assist

>Check Auditorium

.Set Reference

Appendix A

Advanced Operations

A.1 Using Auditorium Assist

The Dolby

Auditorium Assist

feature provides an indication of the stability and

characteristics of your theatre’s speakers, crossovers, amplifiers, and auditorium

acoustics. Use of this feature requires a Dolby Cat. No. 735 microphone mounted

along the rear wall of the auditorium.

After installation of the microphone, the installation engineer performed the initial

reference calibration. The frequency response and sound level of each speaker were

checked and stored in the CP650 memory. Whenever Auditorium Assist is

subsequently selected, all channels are measured and compared to these reference

settings. Auditorium Assist also checks and compares the level of the ambient noise

floor in the auditorium to the reference level originally stored.

Operation

The Auditorium Assist sound-check function can be performed at any time. Set up the

following conditions before activating the Auditorium Assist measurement function:

• Curtains and masking fully open

• Auditorium unoccupied

• Doors closed

• Heating and air conditioning system switched to a known and repeatable

condition

The Auditorium Assist sound-check function can be performed at any time.

1. To move the display to the Auditorium Assist menu, press multiple times, or

press and hold the button while rotating the front-panel knob.

2. Use to choose Check Auditorium, then press OK to begin

the process.

Note: The display shows Invalid Reference if the CP650 room equalization settings

were changed after reference measurements were stored, or No Reference if

auditorium measurements were not previously stored. Contact your service

engineer.

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Dolby Laboratories CP650 User Manual Page 35