Low-power FM transmitters provided the audio for open-air cinema experiences, broadcasting the movie’s soundtrack directly to the car radios of attendees. For example, a designated frequency, such as 88.1 FM, would be advertised on the screen and patrons would tune their car radios to receive the audio.
This technology was essential to the drive-in experience, offering a personalized audio feed within the privacy of one’s vehicle. Its adoption marked a significant advancement over earlier, less effective methods like large external speakers, enhancing sound quality and eliminating noise pollution for surrounding communities. The advent of this individualized sound system was crucial to the popularity and success of drive-in theaters throughout their heyday.