monaural sound

Monaural sound, also known as monophonic sound, refers to an audio system that uses a single channel for sound reproduction. This means all sounds are played back through one speaker or a set of speakers that are treated as a single sound source. This contrasts with stereo sound, which uses two or more independent audio channels to create a sense of space and directionality.1

In early motion pictures, monaural sound systems were common, often employing a single amplifier channel and a speaker placed behind the screen. These systems sometimes included a treble cut to manage noise and hiss, a practice that dates back to older audio technologies. While monaural sound provides a basic audio experience, it lacks the depth and immersive quality that multi-channel systems offer.2