Electro-Voice PL77A User's Manual
Contents
1. distance from the sound source to the microphone as shown in Figure 3 Maximum bass response is produced in close up use with the microphone 1 4 inch from the sound source Minimum bass response is experienced at distances greater than 24 inches The solid curves in Figure 3 show the response variation with distance with the bass contour switch in the normal position The dashed curves show the variation with the contour switch in the roll off position Useful special effects can be created by an imaginative application of the PL77A s proximity effect 1 By working closer to the micro phone the human voice will sound more robust although intelligibility may be adversely affected 2 Working close to the PL77A provides a reduced tendency to PA system feedback over and above that provided by the cardioid directional characteristic and close working distance alone When close talked the substantial bass boost provides an increase in overall Microphone output level The mixer gain may be proportionately reduced resulting in a reduction of the system s sensitivity to feedback caused by sound entering the microphone from the distant loudspeakers 3 For musical instrument pickup the variable bass response can be utilized to achieve a clean bass pickup at a distance of 24 inches or more By moving the PL77A to a few inches from the instrument bass will be increased Caution note with the sound s2. please write Service Depart ment Electro Voice Inc 600 Cecil Street Buchanan Michigan 49107 Phone 616 695 6831 or 8234 Doe Avenue Visalia CA 93277 209 625 1330 1 Electro Voice also maintains complete facilities for non warranty service of E V products Specifications subject to change without notice Part Number 53765 020 a GUIEON cowan ELECTRO VOICE Inc 600 CECIL ST BUCHANAN MICH 49107 MANUFACTURING PLANTS AT B BUCHANAN MICH E NEWPORT TENN E SEVIERVILLE TENN E GANANOQUE ONT E LITHO IN U S A
3. SPECIFICATIONS Generating Element Electret condenser Frequency Response see Figure 3 50 20 000 Hz Polar Pattern see Figure 4 Cardioid Impedance 150 ohms balanced Output Level 50 dB with phantom power or 4 5 volt battery 54 dB with 1 5 volt battery 0 dB 1 mW 10 dynes cm EIA Sensitivity 144 dB with phantom power or 4 5 volt battery 148 dB with 1 5 volt battery Dynamic Range 100 dB with phantom power or 4 5 volt battery 94 dB with 1 5 volt battery Equivalent Noise Level Less than 30 dB O dB 0002 dynes cm A weighted Power Supply 4 5 or 1 5 volt internal battery not included or 24 to 48 volt phantom supply Battery Selection Guide 4 5 Volt Battery Carbon Zinc Eveready No 333 Alkaline Mallory PX 21 Eveready 523 Burgess AL 523 Panasonic PX 21 Mercury Mallory TR 133 Eveready E 133 Burgess H 133 Panasonic H3P 1 5 Volt Battery Any AA size cell Current Drain 1 mA from 1 5 volt battery 3 5 mA from 4 5 volt battery or phantom power Battery Life 4 5 Volt Battery Carbon Zinc 150 hours Alkaline 175 hours Mercury 350 hours 1 5 Volt Battery In excess of 1000 hours for any type AA size cell Do not use below 4 5 C 40 F Elecio Voice a gultan company Model PL7 Condenser Cardioid Vocal Microphone Switches Two Bass contour and battery on off Pop Filter Built in Acoustifoam filter Case Material Diecast zinc amp alumi
4. equency range see Figures 3 and 4 provide high feedback resistance when working close to sound reinforcement speakers and monitors A built in Acoustifoam blast filter enables close talking or singing without worry of P popping or other excessive breath and sibilant noise The very low mass of the generating element acts as an effective shock mount which keeps handling noise to a minimum The rugged construction of the PL77A makes it unique among other condenser microphones The case is constructed of rugged diecast zinc and the battery compartment sleeve is made of aluminum The Memraflex grille screen resists deformation The PL77A may be ohantom or battery powered see the following section POWERING THE PL77A Unlike normal condenser microphones the electret condenser does not need a polarizing voltage because a permanent charge is captured in the diaphragm material However a small voltage with low current drain is necessary to power the FET impedance converter which must be used to lower the extremely high impedance of the electret head Phantom Powering Powering the PL77A may be accomplished by use of an external DC phantom power source within the range of 24 to 48 volts The Electro Voice AC24M is designed for this purpose With three AC24S expander modules up to fourteen PL77A s may be powered Battery Powering The PL77A may also be powered by an internal battery To prolong battery life the PL77A
5. num Dimensions 191 mm long 7 5 25 4 mm 1 0 shank diameter 50 8 mm 2 0 maximum diameter Weight 343 grams 12 oz with battery but not including cable Finish Non reflecting gray Accessories Furnished 301 stand adapter Zippered vinyl carrying case Optional Accessories 376 windscreen 380 attenuator AC24M power supply 541 25 professional cable with ASF type connector at mike end 542 25 professional cable with A3F amp A3M type connectors 543 25 professional cable with switch connector at mike end 544 50 professional cable with A3F amp A3M type connectors FIGURE 1 Dimensions PHANTOM AMPLIFIER BOARD FIGURE 2 Wiring Diagram lt BASS CONTOUR SWITCH tae POSITION 8 amp amp SSxsss 8 8888s EF FREQUENCY IN HERTZ FIGURE 3 Frequency Response DESCRIPTION amp APPLICATIONS The Electro Voice PL77A is a Single D electret condenser cardioid microphone designed for the professional vocalist The unusually extended shaped high frequency response provides a natural transparent sound quality not available in the usual vocal microphones see Figure 3 The Single D design provides the up close bass boost proximity effect preferred by many entertainers In addition the PL77A features a two position bass response switch which effectively tailors the sound to fit the voice Unusually uniform directional characteristics over the entire fr
6. ource lips closer than 2 inches bass response is increased dramatically as shown in Figure 3 If too much signal is generated at the microphone over loading in the amplifier input circuits may occur causing severe distortion MAINTENANCE INSTRUCTIONS You have purchased one of the finest electret condenser microphones available A little care will allow you continued use of this precision instrument for many years Your electret condenser microphone should not be left in the open sun or other hot environments where temperatures may approach or exceed 54 4 C 130 F tor any period of time Following this suggestion will prolong the life of the generating element If you feel your unit is malfunctioning have it examined and repaired only by an Electro Voice authorized repair service station WARRANTY Limited All Electro Voice PL Microphones are guaranteed for two years from date of original purchase against defects in workmanship and materials 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 Warranty does not cover finish or malfunction due to abuse or operation at other than specified conditions Repair by other than Electro Voice or its authorized service agencies will void this guarantee For repair information and service locations
7. s on off switch should be in the off position when the micro phone is not in use Usually as a battery approaches the end of its service life a gradual but noticeable reduction in microphone output level occurs allowing replacement of the battery without a program interruption Access to the battery compartment is gained by unscrewing and pulling away the sleeve shown in Figure 5 exposing the battery clips A 4 5 or 1 5 volt battery may be inserted being sure to follow the polarization plus and minus label A 4 5 volt battery should be used for maximum output level and dynamic range The more easily obtainable 1 5 volt AA size battery will produce a slightly lower dynamic range and output level see Specifications section Specific batteries and battery life figures are also shown in the Specifications section In general alkaline and mercury batteries are recommended because of much greater shelf life and less likelihood of leakage However with regular usage a fresh carbon zinc battery will give nearly as along a service life due to the low current drain of the PL77A Phantom Power Battery Back Up The PL77A with 4 5 volt internal battery and battery power switch on can be used as a back up when the microphone is powered from an external supply When faced with failure of the external supply the PL77A will draw its power from the internal battery without interruption of the audio signal Cau
8. tion Do not operate from a phantom supply with a 1 5 volt battery installed Under this condition if the battery power switch is on the phantom power will tend to charge the low voltage battery No immediate harm will result but the small charging current over a period of time can cause the battery to leak with attendant corrosion damage USING THE BASS CONTOUR SWITCH The bass contour switch shown in Figure 5 provides a tailoring of sound quality to a specific voice or sonic preference With the switch in the normal position the up close bass boost proximity effect inherent in the Single D design provides a much more robust sound than the usual dynamic vocal mike This sound has proven to be very popular In the roll off position a less bass heavy sound results akin to that found in dynamic Single D vocal mikes 200 Hz and 1 000 Hz 180 5 000 Hz eeeeee 10 000 Hz SCALE IS 5 DECIBELS PER DIVISION FIGURE 4 Polar Response CP TS Fe Pa Ta A adas e ee PTET E Fa F gt ATA s COMPARTMENT SLEEVE NOTE SWITCH IS RECESSED TO PREVENT ACCIDENTAL OPERATION NORMAL BASS FREQUENCY RESPONSE ROLLED OFF BASS POSITION FREQUENCY RESPONSE POSITION BASS CONTOUR SWITCH FIGURE 5 Battery Replacement On Off Switch amp Bass Contour Switch USING THE VARIABLE LOW FREQUENCY RESPONSE PROXIMITY EFFECT The PL77A s low frequency response varies with the
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