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Usl UPC-21 Instruction Manual
Also see for UPC-21: Instruction manual
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- 6 -UPC-21 INSTRUCTION MANUAL Ultra Stereo Labs, Inc.q PRELIMINARY LEVEL SETTINGIf the system is to be used with a cinema sound system, simply run a standardoptical track 50% modulation loop in the projector (e.g., Dolby® orUltra Stereo®). Then adjust the IRC-21 Input Level Adjust trimpot so that asthe gain is increased, the green “Signal Present” LED just comes on.If the system is being used with other sources such as tape, then adjust theInput Level control so that a standard “0” reference level tape plays back sothe “Signal Presence” LED just begins to illuminate. With normal audio signal,the LED should flash occasionally.Note: The IRC-20 has an automatic shutoff circuit. The unit willshut itself off after an thirty-minute absence of audio signal.When the audio resumes, the panel will switch on instantly.q Mounting the Emitter/Modulator at the front of the auditorium(See Figures F and G) Attach the supplied mounting bracket to the wall surfaceand use the supplied screws to attach the bracket to the emitter. Allow freeairflow around the emitter and be sure to have at least eight inches clearancefrom all surfaces, preferably more if at all possible. The rear panel is used asa heat sink and the heat must be allowed to dissipate. The unit should bemounted to the side of the screen/stage area, 12 to 15 feet above the audience’sheads and pointed downward and into the seating area.q Mounting the Emitter/Modulator at the rear of the auditorium(See Figures H and J) Attach the supplied mounting bracket to the wall surfaceand use the supplied screws to attach the bracket to the emitter. Allow freeairflow around the emitter and be sure to have at least eight inches clearancefrom all surfaces, preferably more if at all possible. The rear panel is used asa heat sink and the heat must be allowed to dissipate. The emitter will covera 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 emissionincreases to over 140°. Within 18 feet of the emitter the vertical dispersionangle of emission increases to 180°. The emitter can be mounted 12 to 15feet above the audience’s heads. The unit should be pointed downward intothe seated area (Fig. G, J).CAUTION: The rear panel may get quite warm to the touch. This is normal. |
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