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Description and Applications The Electro-Voice Model 655-A is a dynamic, omnidirectional type microphone designed and engineered to the highest standards of high-fidelity FM, AM, and TV Broadcast service. The exterior dimensions of the micro*phone make it particularly useful in solving the problems of TV staging. Yet, its slim, trim design is made possible without the necessity for closely associated auxiliary equipment. The traditional concept of bulk in dynamic microphones has been abandoned in the Model 655. Microphone diameter is only one inch and its length is less than 10 inches. The capacity of the magnetic circuit is equivalent to that of microphones having heads four times as large. The baton design of the 655 makes it handy for “pass-around” use in audience participation and man-in-the-street shows. The microphone can be worked from any or all directions without audible frequency discrimination. Physical Microphone case is high tensile, lathe-turned aluminum, finished in handsome Alumilite. Black Alumilite finish with satin chrome trim is optional. The microphone is available with two grille styles. Model 655 has an attractive streamlined, fluted aluminum grille. Model 655-A (seen on this page) is equipped with a “pop-proof” acoustically treated wire mesh grille which stops wind and breath blasts. The microphone may be mounted directly on an upright stand or on a swivel which permits directing the microphone toward the sound source. The swivel is easily removed from the stand when the microphone is to be carried by hand. Both microphone and swivel are provided with ½" pipe thread. A 5⁄8"-27 thread adapter is supplied. Acoustical The Model 655 microphone is non-directional at low frequencies, becoming slightly directional at extremely high frequencies. This characteristic is a function of the diameter of the microphone case and does not classify the 655 as a directional microphone. However, this feature, combined with the ability of the microphone to be tilted 180°, provides a method of minimizing high-frequency feedback in public address applications. Microphone diaphragm is E-V’s exclusive Acoustalloy, modified for optimum modulus of elasticity. Diaphragm diameter is only 7⁄8". Because case cavity size is directionally proportional to diaphragm area, the reduced case dimensions are possible with no loss of efficiency. Acoustalloy permits smoother response over a wider frequency range and is practically indestructible under normal use, resisting high humidity, temperature extremes, corrosive effects of salt air and severe mechanical shocks. The grille is calculated to give polar curve characteristics most desired in studio broadcast service. No frequency discrimination is audible when the microphone is worked from any position within 90° of its vertical axis. The “pop-proof” grille of the 655-A is acoustically treated to stop wind and breath blasts.