Electro-Voice N/D857 User's Manual
Contents
1. y riso 5 dB PER DIVISION FIGURE 2 Polar Response FIGURE 4 Wiring Diagram N D 857 The dynamic element of the N D857 provides reliable operation in humidity and temperature extremes The handle is made from an aluminum extrusion which is covered with the unique elastomeric Warm Grip This design provides the strength lightweight and comfort wanted for on stage handheld usage The Memraflex grille screen is made from a specially hardened material to resist damage This all metal core construction will provide years of trouble free on the road operation The exceptional sensitivity of the N D857 combined with the inherently low noise of a dynamic transducer insures a Superior signal to noise ratio ready for high dynamic range sound systems To further reduce noise a highly effective hum bucking coil is used to cancel hum from lighting and other sources OPERATION The switch selected bass response of the N D857 allow the user the option of inserting a second order filter to reduce the handling noise significantly with only a small loss of low frequency response The normal switch position provides a flat response when the microphone is positioned further than 12 inches from the sound source Low frequency response can be extended by positioning the microphone closer to the sound source as noted in the specification section This proximity effect occurs when the microphone is placed within 12 inches of the soun2. Warranty does not extend to finish appearance items cables cable connectors switches or malfunction due to abuse or operation under other than specified conditions nor does it extend to incidental or consequential damages Some states do not allow the exclusion or limitation of inciden tal or consequential damages so the above exclusion may not apply to you Repair by other than Electro Voice or its authorized service agencies will void this guarantee A list of authorized service centers is available from Electro Voice Inc 600 Cecil Street Buchanan MI 49107 AC 616 695 6831 FAX 616 695 1304 or Electro Voice West 8234 Doe Avenue Visalia CA 9329 1 AC 209 651 7777 FAX 209 651 0164 This warranty gives you specific legal rights and you may also have other rights which vary from state to state
3. IV compa 7 SPECIFICATIONS Frequency Response Close Response Far Response see Figure 1 Polar Pattern see Figure 2 Sensitivity Open Circuit Voltage Power Level measured at 1 000 Hz Dynamic Range Equivalent Output Noise Impedance measured at 1 000 Hz Case Grille Inner Handle Sleeve Dimensions Length Diameter Shank see Figure 3 Finish Weight Net Shipping Accessories Included Optional Accessories Replacement Parts 20 mm 0 BO in 25 to 22 000 Hz 50 to 22 000 Hz Supercardioid 3 5 mV Pascal 50 dB 0 dB mW Pascal 144 dB 14 dB 0 dB 0002 dyneicm 150 ohms balanced rated Lo Z 320 ohms actual Steel Memraflex Aluminum Elastomeric 7 40 inches 188 mm 2 25 inches 57 mm 0 80 inch 20 mm Non reflecting black 7 9 ounces 225 grams 1 41 Ibs 620 grams Warm Grip handle 323 stand clamp vinyl carrying case PLC 25X cable PLC 25P cable 380 attenuator Warm Grip 72251 Transducer S A 81963 FIGURE 3 Dimensions A Reduced Bass Position 57 mm 2 25m pE t LO He SL SE 0 20 30 50 100 200 500 t norm 180 500 1000 Hz e lt EEESEEHI EE nc i 1000 2000 5000 10000 20000 FREQUENCY IN HERTZ HH aed Close Response FIGURE 1 Frequency Response Ta a 180 6 500 10 000
4. N D Series II Supercardioid Dynamic Vocal Microphone Er SR ee CRTs Le Raana The Electro Voice N D857 is asupercardioid dynamic microphone utilizing a revolutionary neodymium alloy to form the EV exclusive N DYM magnet The N D857 was designed and field tested by the Electro Voice engineer ing team for the specific real world conditions of high performance high level concert sound applications All aspects of microphone performance including frequency response polar response high SPL performance handling noise characteristics and vocal P pop resistance were examined and optimized for concert applications The N DYM magnet has over four times the power potential of conven tional microphone magnets providing unprecedented sensitivity The N D857 has up to 7 dB more output sensitivity over conventional designs while the more uniform magnetic field lowers distortion during peak sound pressure levels The microphone element uses a large diaphragm which has 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 N D857 is built using EV s DynaDamp shock mount material This shock mount design dampens as well as isolates the microphone element from mechanically induced noise To work optimally in concert sound applications the DynaDamp shock mount is tuned to a low resonant frequency A
5. d source and increases as the working distance is reduced The rolled off switch position lowers the extreme bass content to reduce mechanically induced noise Patent numbers 4 745 020 4 824 715 and 4 646 875 CERTIFIED PERFORMANCE Every N D857 microphone is inspected by a quality control tester and subjected to a computer controlled test system that verifies many 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 D857 will perform to the exacting standards established by EV design engineers 100 quality assurance testing WARRANTY LIMITED Electro Voice N D Series Il 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 Any active elec tronics incorporated in the microphone are guaranteed for three years from date of original purchase for parts and labor against such malfunction If such malfunction occurs microphone will be repaired or replaced at our option without charge for materials or labor if delivered prepaid to the proper Electro Voice service facility Unit will be returned prepaid
6. switchable second order L type series high pass filter 12 dB per octave slope tuned at 80 Hz operates in conjunction with the shock mount to reduce mechanical noise This combination has been adjusted to preserve the accurate reproduction of the male voice range while reducing the problems of low frequency noise in the vocal inputs The N D857 is designed to work with the extended response woofer systems used in concert sound for reproducing the instruments where simpler shock mounts or filters are not adequate The microphone has an extra large grille screen and two stage P pop filter to reduce wind blast noise a problem especially troublesome where extended response woofer systems are used Within the grille screen is a special pop filter retainer which holds the Acoustifoam filter in the optimum position for reducing wind blasts The retainer makes the clean ing of the grille screen and pop filter a simple task desirable for on the road use where stage makeup and perspiration often enter the microphone The N D857 is derived from the popular N DYM series of microphones The transducer is a special modification of the basic N DYM Series design which increases the sensitivity and tightens up the polar pattern to increase gain before feedback All the sound quality and performance characteristics of the N DYM series has been preserved while adding the characteristics required for concert sound application ElectroVoice a MARK
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