User manual ELECTRO-VOICE RE90B EDS

[. . . ] The polar pattern of the RE90B is half-cardioid (halfspace cardioid) to promote good gain-before-feedback and suppress ambient noise (see Figure 2). All boundary type microphones operated on a flat surface are subject to an increase in sensitivity of the microphone with increasing frequency; this is called the baffle effect. [. . . ] The RE90B is provided with the miniature shielded cable connected to the microphone for temporary installation. For permanent installation, the cable can be routed through the bottom of the microphone. The cable is disconnected from the microphone by first removing the cross-recessed screw on the top of the microphone, removing the protective grille screen and pop filter, then loosening the three screws on the terminal block. When reattaching the miniature cable, the contacts' functions are printed on the printed circuit board (see Figure 4). The balanced signal appears across Pins 2 and 3 while the RE90B/RE90BW Full-Range Condenser Desk-Mount Microphone ground (shield) connection is Pin 1 (DIN 45 594). The output is phased so that positive acoustic pressure on the transducer's diaphragm produces a positive voltage on Pin 2 in accordance the industry convention. Architects' and Engineers' Specifications The microphone shall be a back-electret condenser type with a frequency response of 80 Hz to 15 kHz. The microphone shall have a half-cardioid pattern with a rear response which is typically 15 dB below the front response at 1. 0 kHz. The microphone shall have an output power level of -33 dB, where 0 dB = 1 milliwatt per pascal, and the output shall not be appreciably affected by the following temperature and humidity extremes: -29° to 74° C (-20° to 165° F) when the relative humidity is 0-50%; -29° to 57° C (-20° to 135° F) when the relative humidity is 0-95%. The microphone shall have a nominal, balanced transformerless output impedance of 200 Ohms. The microphone shall have a non-reflective black finish (RE90B) or a non-reflective white finish (RE90BW). Dimensions of the RE90B shall be 94. 1 mm (3. 7 in. ) wide, 128. 4 mm (5. 1 in. ) long, and 16 mm (0. 63 in. ) high; the cable shall be 1. 8 m (6 ft) long, 2. 6 mm (0. 106 in. ) in diameter and terminated in a black, non-reflecting male XLR-type connector. [. . . ] Additional details are included in the Uniform Limited Warranty statement. For warranty repair or service information, contact the service repair department at: 616/695-6831 or 800/685-2606. [. . . ]