UPC-1/UPC-2 Installation Manual
8
January, 1999
➤
PRELIMINARY LEVEL SETTING
If the system is to be used with a cinema sound system, simply run a standard optical
track 50% modulation loop in the projector (e.g., Dolby
®
or Ultra
★
Stereo
®
). Then adjust
the IRC-20 Input Level Adjust trimpot so that as the gain is increased, the green 50% LED
just comes on. This is the center LED on the IRC-20.
If the system is being used with other sources such as tape, then adjust the Input Level
control so that a standard “0” reference level tape plays back so the 50% indicator light just
begins to illuminate. With normal audio signal, the 50% light should flash occasionally.
Note: The IRC-20 has an automatic shutoff circuit. The unit will shut itself off after an
eight-minute absence of audio signal. When the audio resumes, the panel will switch on
instantly.
➤
MOUNTING THE EMITTER/MODULATOR AT THE FRONT OF THE AUDITORIUM
(See Figures F and G) Attach the supplied mounting bracket to the wall surface and use
the supplied screws to attach the bracket to the emitter.
Allow free airflow around the
emitter and be sure to have at least eight inches clearance from all surfaces, preferably
more if at all possible.
The rear panel is used as a heat sink and the heat must be allowed
to dissipate. Mount the emitter so that the heat sink fins are at the
top
. The unit should be
mounted to the side of the screen/stage area, 12 to 15 feet above the audience’s heads
and pointed downward and into the seating area.
➤
MOUNTING THE EMITTER/MODULATOR AT THE REAR OF THE AUDITORIUM
(See Figures H and I) Attach the supplied mounting bracket to the wall surface and use
the supplied screws to attach the bracket to the emitter.
Allow free airflow around the
emitter and be sure to have at least eight inches clearance from all surfaces, preferably
more if at all possible.
The rear panel is used as a heat sink and the heat must be allowed
to dissipate. Mount the unit so that the heat sink fins are at the
top
. The emitter will cover
a maximum of 5500 square feet (60' X 84') and has a primary 50
°
(
±
25
°
) vertical and
horizontal coverage angle, usually adequate for a 350-seat theatre. Within 30 feet of the
emitter the horizontal dispersion angle of emission increases to over 140
°
. Within 18 feet
of the emitter the vertical dispersion angle of emission increases to 80
°
. The emitter can
be mounted 12 to 15 feet above the audience’s heads. The unit can be pointed either
downward into the seated area (Fig. I-A), or directly towards the screen to reflect back to
the audience (Fig. I-B).
CAUTION: The rear panel may get quite warm to the touch. Power down and allow a
few minutes for the surface to cool before handling the IRC-20.
