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 Blumleinshuffled stereo techniques have never been used commercially, they have unique advantages. Various implementations and uses are described, incuding improved results from dummy-head and Theile sphere microphones and uses with boundary-layer, cardioid, and shotgun microphones.
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