Electro-Voice N/D257 User's Manual
Contents
1. useless For years of trouble free operation on the road the N D257 utilizes an all metal core construction from the hardened windscreen to the Warm Grip covered handle Patent Pending CERTIFIED PERFORMANCE Every N D257 is inspected by a quality control technician and subjected to a computer controlled test system that verifies over 80 different performance parameters After the performance meets or exceeds our rigorous standards the actual measured frequency response of the unit tested is plotted on a Certificate of Performance and included with the microphone This certificate guarantees that each N D257 will perform to the exacting standards established by EV design engineers 100 quality assurance testing WARRANTY LIMITED Electro Voice N D Series Microphones are guaranteed against malfunction from any cause for a period of two years from date of original purchase Also these microphones are guaranteed without time limit against malfunction in the acoustic system due to defects in workmanship and material Other provisions apply please see warranty card enclosed with microphone or write for complete details ELECTRO VOICE INC 600 Cecil Street Buchanan Michigan 49107 MANUFACTURING PLANTS AT W BUCHANAN Mi E NEWPORT TN W SEVIERVILLE TN E REDMOND WA E GANANOQUE ONT Electro Voxe inc 1987 M Leho in USA Pant Number 530840 729 MARK IV company2. Ev ElectroVoice N D Series MUSIC MICROPHONES Cardioid Dynamic Vocal Microphone The Electro Voice N D257 is a cardioid dynamic microphone utiliz ing a revolutionary neodymium alloy to form the EV exclusive N DYM magnet with four times the power potential of conven tional microphone magnets With a computer optimized design the N DYM magnetic structure provides unprecendented sensitivity while the more uniform magnetic field lowers distortion during peak sound pressure levels The large diaphragm contains 50 percent more surface area than conventional designs and is reinforced to prevent breakup The result is an extended high frequency response with an open transparent sound quality The exceptional sensitivity of the N D257 combined with the inherently low noise of a dynamic transducer insures a superior signal to noise ratio ready for digital recording and sampling The N D Series design also features a unique shock mount totally surrounding the microphone element Combined with the elastomeric Warm Grip handle and windscreen bumper this vibration isolation system greatly reduces all forms of handling noise An Acoustifoam pop filter is included to reduce both wind noise and p pop breath sounds The uniform cardioid polar pattern of the N D257 insures superior gain before feedback in live applications and better isolation in the studio at all frequencies compared with other directional micropho
3. nes with widely varying polar characteristics FREQUENCY RESPONSE a Ce a el on D oe gt anna T ae FREQUENCY IN HERTZ SPECIFICATIONS Frequency Response Close Response Far Response Polar Pattern Open Circuit Voltage Sensitivity Dynamic Range Equivalent Output Noise Impedance Weight Dimensions Height Diameter Shank 35 to 19 000 Hz 65 to 16 000 Hz cardioid 2 2 mV Pascal 1000 Hz 53dB where 0 dB 1mW 10 dynes cm 141 dB 17 dB 0 dB 0002 dyne cm 150 ohms balanced Lo Z 7 05 ounces 200 grams 7 12 inches 181 mm 2 05 inches 52 mm 0 80 inch 20 mm N D 257 The high and low frequency response of the N D257 can be extended by positioning the microphone closer to the sound source as documented in the specification section This baffle and proximity effect occurs when the microphone is placed within 12 inches of the sound source and increases as the working distance is reduced The low frequency response is tailored to provide bass boost without the boominess of many directional microphones Thus closer Working distances can be used with N D257 to reduce the risk of sound system feedback ringing while preserving intelligibility The dynamic element of the N D257 will provide reliable operation in humidity and temperature extremes adverse conditions that would render condenser microphones
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