Model 819 User Guide
Contents
1. RELATIVE RESPONSE IN d o tui 4000 10 000 20 000 FREQUENCY IN HERTZ TYPICAL FREQUENCY RESPONSE FIGURE 1 Polar Pattern Half cardioid cardioid in hemisphere above mounting surface uniform with frequency symmetrical about axis see Figure 2 400 to 4 000 Hz Seco 8 000 Hz seen eeee 10 000 Hz TYPICAL POLAR PATTERN FIGURE 2 Output Impedance 600 Q Recommended Minimum Load Impedance 800 Q Output Level at 1 000 Hz measured with sound source at 300 incidence to infinite surface Open Circuit Voltage 73 0 dB 0 22 mV 0 dB 1 V Aubar Output Clipping Level at 1 000 Hz 3 THD 2 000 Q load 10 dB 0 32 mV 800 Q load ce eee ee eee 17dBV 0 14V Maximum SPL at 1 000 Hz sound source at 300 incid ence to infinite surface 2 000 Q load cece eee eee 137 dB 800 Qildad arrede nnen ede aa deeds 132 dB Hum Pickup 2 dB equivalent SPL in 1 mOe field 60 Hz Output Noise 26 dB SPL A weighted 31 dB SPL weighted per DIN 45 405 Signal to Noise Ratio 68 dB re 94 dB SPL Dynamic Range 111 dB Phasing Positive pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of power supply output connector Power Battery One 9 Vdc alkaline NEDA 1604A approx imately 2500 hours continuous with fresh alkaline bat tery Phantom Voltage 11 to 52. SHURE MODEL 819 SURFACE MOUNTED UNIDIRECTIONAL CONDENSER MICROPHONE The Model 819 Microphone is designed especially for surface mounted applications It is a superior quality per manently biased electret condenser microphone with a hemi cardioid directional pattern cardioid in the hemi sphere above the mounting surface The 819 is particularly suited for sound reinforcement and recording of speech singing or acoustic instruments in locations like churches schools conference rooms and theaters Whenever an inconspicuous high output high fidelity unidirectional surface mounted microphone is desir able the 819 is a logical choice The microphone design relies on the fact that sound pressure doubles at a barrier or boundary compared to its value if the boundary is removed When placed sufficiently near the boundary surface a microphone has effectively 6 dB higher sensitivity and approximately 3 dB greater rejec tion of random background noise Because of its half cardioid unidirectional polar pat tern the 819 discriminates against sounds originating from the rear suiting it for conditions where an omnidirectional pattern makes other surface mounted microphones imprac tical This built in unidirectionality can be an enormous ad vantage when it is desirable for instance to isolate pickup of a particular vocalist instrument or performer from the rest of a group or to discriminate against audience pickup Be
3. VALUES SHOWN ARE TYPICAL AND MAY 3 THE FOLLOWING SYMBOLS DENOTE VARY 20 oe aO Ou Ou CRINS CIRCUIT BOARD amp INPUT SIGNAL OF O LYRMS AT S ROUND KHZ APPLIED TO PIN N23 Ol S INPUT CONNECTOR THROUGH T 2 K SLE SERIES IOup CAPACITOR LY Co oc AG A 33 K 5 Ye WATT RESISTOR iS VOLTAGE VOLTAGE Conneetes BETWEEN PIN 2 AND JUNCTION OF 1 2K I u CAPACITOR l 7 DC VOLTAGE WHEN POWER SOURCE 1s O 4 POWER SOURCE IS 9 VDC RETWEEN ZIVDC THROUGH TWO 2000 OHM 7e BaNPDC AS SHOW RESISTORS FROM POSITIVE SUPPLY TO a N2 3 OF TH PUT CONNECT POWER SUPPLY CIRCUIT DIAGRAM FIGURE 5 POWER SUPPLY PC BOARD FIGURE 6 Designation Alternate 95R V973 Connector Cable 3 socket Miniature Switchcraft TASF W973 X973 Y973 538A1879C 37A147 Inner Screen Microphone Al A2 C1 C2 J1 MP1 MP2 Pi Switchcraft a M For additonal service or parts information please contact the Shure Service Department at 1 800 516 2525 Outside the U S A contact your authorized Shure Service Center Grille Microphone None The Sound of Professionals Worldwide Shure Brothers Incorporated 222 Hartrey Avenue Evanston IL 60202 3696 U S A
4. cause of the unidirectional polar pattern no physically isolat ing barriers are required and directionality is maintained to low frequencies The 819 can be used for individual instrument pickup e g mounted inside the lid of a grand piano or on the floor next to a bass drum Experimental placement and critical lis Shure Brothers Incorporated 222 Hartrey Avenue Evanston IL 60202 3696 U S A Model 819 User Guide ace tening will demonstrate the best microphone location for any particular purpose or effect desired The optimized design of the 819 includes a new cartridge developed at Shure The result is high output ac curate sound reproduction over the entire audio frequency range and off axis performance comparable to the finest unidirectional microphones The 819 provides low distortion and high signal to noise ratio for distinguished performance even under difficult acoustic conditions The 819 is powered either by a single 9 volt alkaline bat tery 2500 hours continuous battery life or by an 11 to 52 volt phantom supply from sound reinforcement or recording equipment The system is designed so that the Battery sup ply will automatically switch in should the phantom power fail The output impedance is 600 ohms compatible with bal anced line low impedance microphone inputs The 819 consists of a small rugged surface mounted microphone finished in durable platinum beige enamel and a sturdy power supply with battery
5. compartment and two 2 conductor shielded attached cables one small diameter 7 6m 25 ft with 3 socket Tini Q G connector to mate with the microphone and one 3m 10 ft with 3 pin professional audio connector to mate with a mixer amplifier or tape re corder microphone input Features e Wide flat frequency response for accurate sound repro duction across the audio spectrum e Fixed low frequency rolloff to minimize pickup of room noise from air conditioners furnace fans etc Half cardioid polar pattern minimizes pickup from rear of microphone permits aiming microphone toward per formers and away from audience or toward singers and away from instruments e High sensitivity and high signal to noise ratio e Battery or phantom powering uses standard 9 volt bat tery accepts wide range of phantom voltages e Low susceptibility to RFI electrostatic and electro magnetic hum e Extremely rugged construction of microphone and pow er supply for outstanding reliability e Low profile platinum beige finished microphone for in conspicuous but handsome appearance onstage on floor table ceiling wall or lectern e Usable over very wide range of temperature and humidity Copyright 1997 Shure Brothers Inc 27A2094 QB Printed in U S A SPECIFICATIONS Type Cardioid condenser electret bias for surface mounting Frequency Response 60 to 20 000 Hz at 300 incidence to infinite surface see Figure 1
6. 2 Vdc operational down to 5 Vdc 0 2 mA current drain permissible to use phan tom power with batteries in place or removed Cables Attached to power supply One 7 6m 25 ft 2 conductor shielded small diameter interconnecting cable with 3 socket miniature Switch craft Tini Q G connector to mate with microphone output connector One 3m 10 ft 2 conductor shielded output cable with 3 pin professional audio connector Case Microphone Platinum beige enamel die cast base and perforated steel grille with replaceable or clean able fine mesh screen and foam pad wind dirt barrier Power Supply Black molded high impact plastic Dimensions Figure 3 A u a a 1OFT OVERALL DIMENSIONS FIGURE 3 Environmental Conditions Operating Temperature 18 to 57 C 28 to 135 F Storage Temperature 29 to 74 C 20 to 168 F Relative Humidity Operating or Storage 0 to 95 Net Weight Microphone 263 grams 9 3 oz Power Supply 292 grams 10 3 oz with battery and cables POWERING THE 819 The 819 can be powered by a single internal 9 volt battery or by an external phantom supply of 11 to 52 volts DC To Use Battery Power Install a 9 volt alkaline battery A fresh one will power the 819 for 2500 hours continuous use A battery turns on as soon as it is correctly installed The out put of a battery powered 819 can be connected to any bal anced line low impedance microphone input
7. To Use Phantom Power Connect the power supply out put to a balanced line microphone input supplying 11 to 52 Vdc phantom power The battery may be left in place as backup while the unit is phantom powered There will be no battery drain as long as the phantom voltage exceeds 1 5 volts If the phantom source should fail the 819 will automat ically switch to battery power BATTERY INSTALLATION A 9 volt dc alkaline type NEDA 1604A is recom mended To install the battery depress the ridged area of the case and swing the hinged door outward Insert the battery in the compartment battery terminals toward the hinge and positive terminal inward the negative contact is marked in side the compartment Depress the battery slightly and hook it under the ledge in the compartment The ledge and spring contacts will retain the battery even if the door or hinges are damaged Close and lock the door Note that the door will not lock if the battery is incorrectly inserted the pos itive and negative contact areas accept only the correspond ing battery terminals TO PREVENT BATTERY DRAIN if a battery is installed in the 819 and phantom power is switched off the battery will be activated Therefore when the unit is not in use to prevent battery drain either remove the battery or store it in the battery compartment upside down contacts upward and positive contact inward If the 819 is not being used for a prolonged period be sure to re mo
8. ve the battery to prevent the possibility of damage from leakage INTERCONNECTING CABLE One 7 6 m 25 ft cable is supplied attached to the pow er supply for connection to the microphone It is sometimes desirable for the units to be located a greater distance apart Up to 15 m 50 ft of additional cable can be used between the microphone and power supply with no loss in response or output CLEANING When the microphone is located in a dusty environment periodic cleaning may be desirable This can be easily ac complished by removing the Phillips head screw on the grille and lifting off the grille the fine mesh screen and the foam pad Clean the fine stainless steel mesh screen by washing it in soapy water Dry it thoroughly and replace the foam pad screen and grille Fasten firmly with the Phillips screw CONDENSER CARTRIDGE IMPEDANCE CONVERTER 3 PIN MINIATURE CONNECTOR CARTRIDGE ASSEMBLY GROUND BLACK ee ae ae ae a N REAGIS DRAIN SOURCE RED BLUE MICROPHONE CIRCUIT DIAGRAM FIGURE 4 k AS eS RZ D3 D Go vV OK aav gt 8k a645 9y E ANW p e AV Tn 4 TRIG Di T eel 900 O 3 N 8 X35 S7 oO RS op L2K oa N w x x NOTES MINIY 1 ALL RESISTORS 4 WA L car 5 7o UNLESS OTHERWISE Ameo 5 DC_ voLTaAGES MEASURED WITH r E IL MEG INPUT VOLTMETER 3 A 2 ELECTROLYTIC CAPACITORS VOLTAGE CEA SURED wit MEG YELLOW td HOWN IN AE x TS INPUT VOLTMETER
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