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The Electro-Voice N/D457B is a hypercardioid dynamic microphone ideally suited for vocalist in live sound reproduction for large and small venues where ambient sound pressure levels are extreme "hard rock" and gain-before feedback is a problem. The N/D4578 utilizes a revolutionary neodymium alloy to form the EV-exclusive N/DYM"' magnet. With a computer-optimized design, the N/DYM magnetic structure is maximized in the N/D4578 to provide 6 dB more output sensitivity over conventional designs. The exceptional sensitivity of the N/0457B combined with the inherently low noise of a dynamic transducer insures superior signal-to-noise ratio ready for digital recording and sampling. To further reduce noise, a highly effective hum-bucking coil is used to cancel hum from lighting and other power sources.