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I am planning a Theater room in my new home and have some questions about preparation for installing an electric recessed screen. I know the screen motor runs on 110 VAC and the screen is tripped by a low voltage trigger. My question is weather the projector DC output is all I need to plan for wiring or do I need to run to a wall switch for the trigger? I am thinking that if the projector has a DC out that when the projector turns on it will trigger the motor in the screen to come down and go up when the projector is shut off. Any help would be appreciated.