The Electro-Voice Model 664 is a cardioid microphone of the dynamic type with only one moving element. It is designed specifically for public address applications. The cardioid pattern is obtained through use of three sound entrances located in the back of the dia­phragm. These three sound en­trances, each utilizing the proper acoustical impedance, combine to form one effective back entrance which varies in distance from the diaphragm inversely with frequency. The resulting phase and amplitude conditions pro­duce a uniform cardioid pattern over a wide frequency range. This vari­able front-to-back distance along with dynamic-type construction affords high resistance to mechanical shock and eliminates proximity effect.

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