Dolby
®
Model CP650 Installation Manual
Installation
2-4
2.4
Mount the Auditorium Assist Microphone
Auditorium Assist
TM
operation requires the use of the
Cat. No. 735 microphone. Mount the microphone permanently in
the auditorium, at a convenient location away from sound sources.
If the rear wall is used, the microphone should be centered between
surround speakers. Wall plates with an integrated XLR connector
are available. Examples include:
Switchcraft J3FS—Stainless Steel
Whirlwind WP1B/1FND—Black
Connect the microphone to the mic input located on the rear panel of the CP650
cinema processor. If the microphone input in your installation is currently dedicated
to other uses, such as an emergency public address, install the necessary hardware to
switch between microphones.
2.5
Connect the CP650
Refer to the appropriate foldout pages, located at the end of this chapter, showing
connections to the CP650.
Shields must be connected as shown in the foldout pages to avoid radio frequency
interference.
Note:
Follow all local codes and regulations covering electrical wiring. It is
recommended that conduit be used for wiring runs.
Connector shells have been included in your installation kit for use in countries that
are governed by the EMC directives. The shells
must
be used as noted on the foldout
pages.
2.5.1 Motor-Start
Relays
(Models CP650 and CP650D)
For two-projector installations, motor-start relays are required for projector
changeover. Digital data on the soundtrack is read in advance of the picture; therefore
an advanced changeover signal is required. Projector motor-start contact closures
provide this signal to the CP650.
Isolated
contact closures from mechanical or opto-
isolated relays wired across projector motors must be used. Refer to the
Installation
Wiring Inputs and Control diagram
at the end of this chapter.
Signal levels:
Motor Start:
Less than 1 VDC with respect to signal ground
Motor Off:
Greater than 3.5 VDC, less than 18 VDC
If the CP650 is to be used in a platter operation (single projector), a jumper must be
installed. A pre-wired connector is installed at the factory for this purpose.
