Figure 311. Polar response pattern for ElectroVoice Model 642
Cardline directional inline microphone
4. Sensitivity is achieved by a rather heavy magnetic structure consisting of an
Indox 5 and Armco magnetic iron core, approximately 2 1/2 inches in diameter.
a. Dimensions of this size can be used because of the size of the inline
tube; no baffle effects occur, thus directivity is controlled by the openings in
the tube structure.
b. The diaphragm of the dynamic unit is 1 1/4 inch in diameter with a 3/4
by 1 1/4inch voice coil.
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