A new cardioid-line microphone
Robert C. Ramsey · IRE Transactions on Audio · 1960
A new microphone, the Electro-Voice Model 642, is described. Designed particularly for television and motion picture applications where the usable microphone working distance must be a maximum, the model 642 has improved directivity and high sensitivity. The improved directivity is achieved by functioning as a first-order gradient microphone at bass frequencies and as a line microphone at higher frequencies. A detailed description of the directional characteristics is included.