With all audio being summed into a single channel and output through a single speaker, mono does not create the gradient of left and right sound localization enabled by stereo. Mono audio has a more “squished” sound than stereo due to its inherent one-channel limitation. The sum of spatial information conveyed by a stereo field produces what we call a stereo image or a soundstage. With two points of audio output, stereo fields can also introduce illusions of depth in their playback via timing and frequency cues that our brains interpret as spatial information. This allows a listener to gradationally localize sounds between left and right audio channels. With independent left and right channels, stereo audio is able to convey a multi-dimensional audio field between the points of left and right speakers. The different number of audio channels in mono and stereo results in substantially distinct listening experiences between the two formats. A stereo speaker setup uses two speakers, while a mono speaker setup uses just one. File formats and speaker setups can be classified as mono or stereo.
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