The opening closest to the front of the mic is.09375' while the opening at the rear is.0625'. Notice the mic on the left is fitted with plain metallic port inserts that are drilled. On the right is another Model 666 with Serial Number 3048. The Model 666 on the left carries Serial Number 1760. The front-to-back ratio is double to triple that of the average cardioid microphone. This variable front-to-back distance along with dynamic construction affords high resistance to mechanical shock and produces virtually no proximity effect. The resulting phase and amplitude conditions produce a uniform range at the flat position on the preamplifier. The 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 cardioid pattern is obtained through use of three sound entrances located in the microphone case at different distances in back of the diaphragm. The Model 667 is a Model 666 microphone used in conjunction with an in-line transistor preamplifier, which can be seen halfway down this page. The Electro-Voice 666 and 666R cardioid dynamic microphones (Scroll halfway down for information on the 667) Description and Applications The Model 666 is a cardioid microphone of the dynamic type. The FEnder tag on the back that carries the serial numbers specifies 2 16.

The following is additional information about Electro-Voice ten-inch. Description and Applications The Electro-Voice Model 664 is a cardioid microphone of the dynamic type with only one moving element.

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