Shure 556 data sheet

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Operation:No special precautions beyond ordinary care are necessary in the operation of the Model 556 Dy- namic microphone. It will operate efficiently and depend- ably under all ordinary conditions in hot and cold climates. Dropping the microphone or other severe mechanical shocks should be avoided. Acoustic Considerations: The expression "Su- per-Cardiod type" response simply means that the polar characteristic of the microphone approximates a modi- fied cardioid of revolution. There is a wide, useful pickup angle at the front of the microphone while the response at the sides is down 8.5 db from that at the front. The rear response is down of the order of 15 db over a broad range of frequencies. The true unidirectional charac- teristic of the "Unidyne" should not be confused with the relatively slight directional effect at high frequencies only which can be produced by baffle effects in the conven- tional pressure microphone. By directing the rear side of the microphone towards the audience or other source of interfering sound, pickup can be concentrated on the desired source. Reverbera- tion energy pick up is decreased over two-thirds. The microphone can be placed close to reflecting surfaces without objectionable effects if the rear side of the micro- phone is toward the reflecting surface. This is particularly valuable in small broadcast studios. It is desirable to experiment with microphone place- ment and orientation in order to secure the greatest benefits from the unidirectional characteristic. Specifications 1000 C.P.S. Response: Model 556 "L" Position: Open Circuit Voltage Level. . . . . . . .-84.1 db. (*) Loaded With 40 Ohms. . . . . . . . . . . .-90.1 db. (*) Power Level Into 40 Ohms. . . . . . . . . . .-56.1 db. (**) Model 556 "M" Position: Open Circuit Voltage Level. . . . . . . . . .-76.8 db. (*) Loaded With 250 Ohms . . . . . . . . . . .-82.8 db. (*) Power Level Into 250 Ohms. . . . . . . . . -56.8 db. (**)Model 556 "H" Position: Open Circuit Voltage Level. . . . . . . .-57.5 db. (*) Loaded With 100,000 Ohms . . . . . . . .-60.1 db. (*) (*) 0 db. = 1 Volt Per Dyne Per Sq. cm. (**) 0 db. = 1 Milliwatt with 10 Dynes Per Sq. cm. Recommended Load Impedance: Model 556 "L" Position 30-50 Ohms. Model 556 "M" Position 150-250 Ohms. Model 556 "H" Position 100,000 Ohms or More. Model 556 Microphone Horizontal Polar ResponseFREQUENCY-CYCLES PER SECONDFig. B. Typical Frequency Response, Model "556" Microphone.MODEL 556 Code WordRUMUB Net Wt.2¾ lb. Shipping Weight4½ Ibs. Height, Case * 8-3/8"Width* 4-7/16" Thickness* 3-3/16"Height, Overall * 3-9/16" FinishSatin Chrome *See Fig. C. BOTTOM VIEW OF ISOLATION UNIT Guarantee: Each microphone is guaran- teed to be free from electrical and mechanical defects for a period of one year from date of ship- ment from the factory, provided all instructions are complied with fully. In case of damage. return the microphone to the factory for repairs. Our guaran- tee is voided if the microphone case is opened. 27A32 (7-48)