AFTER MORE THAN 70 YEARS IN PRODUCTION, Shureâ€™s Unidyne 55 series easily takes the prize for the longest running, most successful product in audio history. The story begins in 1937 with Shure engineer Benjamin Bauer looking for a single-capsule approach to creating a unidirectional microphone.
He experimented with capsules having front and rear openings that allowed sound waves to reach the diaphragm. Partially blocking the rear openings created a short phase delay that effectively cancelled the sounds from the rear. Varying the rear port resistance created various directional patternsâ€”cardioid, hypercardioid and supercardioidâ€”and the Unidyne was born. In 1939, Shure announced its model Unidyne 55. more