Between 1931 and 1934, Blumlein proposed using a pair of identical ear-spaced microphones pointing in the same direction with a -shuffling- network to create stereo. Although Blumlein-shuffled stereo techniques have never been used commercially, they have unique advantages. This paper describes various implementations and uses, including improved results from dummy head and the Theile sphere microphone, and uses with boundary layer, cardioid, and shotgun microphones.
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https://aes2.org/publications/elibrary-page/?id=6686
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