A Mid-Side stereo is a specialized way of recording and/or processing a stereo audio signal. During the analog days, M-S processing was an important part of mastering for vinyl, and it still holds true until now. It’s still a popular tool for mastering.
A mid-side audio signal replaces the individual left and right audio components of a stereo audio signal with the mid and side components of the stereo audio. It is not only a processing tool but also a stereo microphone technique. A Mid-Side recording utilizes two microphones in a specific configuration. It utilizes two mics with different polar patterns, as a coincident pair with a unique placement.
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