<P> The screen can be as simple as a wall that is painted white , or it can be a steel truss structure with a complex finish . Originally , the movie 's sound was provided by speakers on the screen and later by individual speakers hung from the window of each car , which were attached by wire . These systems were superseded by the more economical and easier to maintain method of broadcasting the soundtrack at a low output power on AM or FM radio to be picked up by a car radio . This also allows the soundtrack to be picked up in stereo by the audience on an in - car stereo system which is typically higher quality and fidelity than the simple speakers used in the old systems . </P>
<P> The screen can be as simple as a wall that is painted white , or it can be a steel truss structure with a complex finish . Originally , the movie 's sound was provided by speakers on the screen and later by individual speakers hung from the window of each car , which were attached by wire . These systems were superseded by the more economical and easier to maintain method of broadcasting the soundtrack at a low output power on AM or FM radio to be picked up by a car radio . This also allows the soundtrack to be picked up in stereo by the audience on an in - car stereo system which is typically higher quality and fidelity than the simple speakers used in the old systems . </P>
how do you hear the movie at a drive in theater
how do you hear the movie at a drive in theater
on AM or FM radio
on AM or FM radio