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What do you see?
• a large outdoor movie screen
• a projection booth
• a snack bar
• a large parking area for cars
Originally, a movie's sound was provided by speakers on the screen.
Later, by an individual speaker hung from the window of each car, which would be
attached by a wire.
Broadcasting the soundtrack at a low output power on AM or FM radio to be
picked up by a car radio.
http://www.itsonlyamovie.co.uk/driveinhistorypage.htm