Click here to download ELECTRO-VOICE 671A (01) PDF MANUAL


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****** Page 1 ****** SPECIFICATIONS Element: Dynamic Frequency Response: 60-14,000 Hz Polar Pattern: Cardioid Impedance: 150 ohm/Hi-Z, Selectable Impedance Change: Rear of connector insert Output Level, Low Impedance: —57 dB (O dB = 1 mW/10 dyne/cm2) High Impedance: -56dB (0 dB = 1 v/dyne/cm2) ElA Sensitivity Rating, 150 Ohm: —151 dB Hi-Z: -152 dB Diaphragm: Acoustalloy@ Switch: On-Off (lockable) Case: Zinc die cast Finish: Satin chrome Accessory Included: 358 stand adapter Optional Accessory: 456 carrying case Dimensions: 157.2 mm (6.19″) long (excluding cable connector), 49 mm (1.97″) largest diameter Weight: 226.8 g (8 oz)- excluding cable Cable, 67 IA: 4.6 m (15 foot), two-conductor, shielded, vinyl jacketed, with Switchcraft A3F connector 671 AP: 4.6 m (15 foot), two-conductor, shielded, vinyl jacketed, with Switchcraft A3F connector at the microphone end and L” phone plug at equipment end DESCRIPTION & APPLICATIONS The new Electro-Voice Model 671 A features high output level while providing a smooth frequency response and excellent gain-before-feedback characteristics. The Model 67 IA isa Single-D cardioid microphone which emphasizes low frequencies when used “close up.” Perfect for the exacting needs of high quality sound reinforce- ment, public addresse and other applications, the 671 A is ruggedly designed and attractively styled. 1.97″ (49mm) a gtJlÜ) cornpany Cardioli Microphone The 67 IA uses the broadcast standard three-pin type connector. In addition the 671 AP has a Ya” phone plug at the equipment eng of the cable. The 671 AP can be operated Hi-Z or unbalanced Lo-Z. (See instructions for changing impedance) A nevv head design and an exclusive Volumetric-hologram designed diaphragm provide exceptionally wide, linear response at all angles of incidence for high gain-before-feedback in sound reinforcement applications, and virtual elimination of off-axis coloration. The head subassembly is user replaceable. As part of this assembly, a newly designed extremely effective shock atX)rber isolates the transducer assembly from mechanical noises. An internal Acoustifoam'” filter allows close talking without excessive “P-popping” and prevents dirt and magnetic particles from accumulating on the diaphragm.. The microphone is equipped with a lock to keep the switch in the “on” position if this is desired. 6.1 9 f’ (157.2mm) FIGURE I—Dimensions

****** Page 2 ****** IJtilizing The Locking Feature: To lock the switch in the ‘ ‘on” position, first turn switch on. Next. using a sharp object such asa nail file or a small screwdriver, slide lock to a position behind the switch actuator (See Fig. 2) . using The Variable Low-Frequency Response: The 671 A’s low-frequency response varies with the distance from the sound to the microphone as shown in the response curve (Fig. 3). Maximum bass response is produced in Close-up use with the microphone 1/4″ from the sound source (Fig. 3/A). Minimum bass response is experienced at distances greater than 24″ (Fig. 3/C). Useful special effects can be created by an imaginative application Of the variable low-frequency response: 3. For musical pickup, the variable bass response can be utilized to achieve “clean” bass pickup at distances of 24″ or more. By moving the 671 A to a few inches from the instrument, bass will be increased. Caution notes: With the sound source (lips) closer than 2″, bass response is increased dramatically (as shown in Fig. 3/A/B). If too much signal is generated at the micro- phone, overloading in the amplifier input circuits may occur, causing severe distortion. I. 2. By working closer to the micro- phone, the human voice will sound more robust, although intelligibility may be adversely affected. Feedback in a public address system is sustained by reflection of sound into the microphone. For all micro- phones, as the artist moves closer, the level of his voice (at the micro- phone) increases and the micro- phone’s signal to the amplifier is increased. For a constant volume of sound from the system, the amplifier gain setting must be proportionately reduced. This results in a reduction of the system’s sensitivity to reflected sound, hence a reduction of the tendency to feedback. The variable low-frequency response of the 67 IA provides a further feed- back reducing advantage in close talking applications. At low- frequency response is greatly enhanced, while response to distant sound (as from sound system loudspeakers) is unaffected. The result is a reduced tendency to feed- back, over and above that provided by the cardioid directional characteristic alone. In short, system sensitivity reduction because of close working, added to the advantage resulting from the bass boosting low-frequency charac- teristic of the 671 A, makes this instrument an exceptionally effective tool for stage and nightclub use. Impedance Change Instructions: Impedance may be changed from Hi- to Lo-Z, or vice-ver”, by changing one pin-connector at the rear of the micro- phone. Turn the setscrew in the connector-insert counter clockwise (it is a reverse-threaded screw and will not come out, but rather disappear into the insert). Pull the insert straight out from the end of the microphone exposing the wires connected to it. (See Fig. 6) For high impedance, the black wire should be connected to Pin 2 of the insert. For low impedanæ, the red wire should be connected to Pin 2. (A sleeve on the connector slides over the pin to insulate and assure a tight connection.) Unbalanced Lo-Z and Hi-Z operation requires that the black wire at the equipment end of the cable be con- nected together with the ground shield to the sleeve (or ground connection) of the 1/4″ phone plug. The white wire is connected to the tip (or positive). (See Fig. 7) This is the way the plug is con- nected on the 671 AP model. Impedance may be changed to unbalanced Lo-Z as described above. Figure 7 also shows the connection for a balanced Lo-Z opera- tion using standard 3-pin connector such as the Switchcraft A3M. ARCHITECTS’ AND ENGINEERS’ SPECIFICATIONS The microphone shall be a cardioid dynamic type. Frequency response shall be 60—14,000 Hz, specially shaped above 11000 Hz to maintain presence for vocal and musical pickups, and below 1,000 Hz shall vary inversely with distance. Response at the front of the microphone at 11000 Hz shall be nominally 20 dB greater than response at rear. The microphone shall be a switchable impedance type (high impedance or 150 ohm balanced or unbalanced low impedance). Output level for high impedance shall be —56 dB (0 dB equalling 1 v/dyne/cm2). Output level for low impedance shalt be —57 dB (O dB equals 1 mW/10 dynes/cm2 Micro- phone shall have an Acoustélloy@ diaphragm. An on-off switch shali be provided and so connected that the transducer is “shorted'” when switch is in off position. A 4.6 m (15 ft), two- conductor. shielded, vinyl jacketed cable with Switchcraft A3F connector installed at the microphone end shall be provided. The case shall be die cast zinc. Dimensions shall be 157.2 mm (6.19″) long, 49 mm (1.97″) diameter. Net weight (less cabie) shall be 226.8 g (8 oz). Finish shall be satin chrome. A Model 358 stand adapter shall be furnished. The Electro,Voice Model 671 A is specified. WARRANTY (Limited) Electro-Voice General Purpose Micro- phones are guaranteed without time limit against malfunction in the acoustic system due to defects in workmanship and materials. (Any active electronics incorporated in a microphone is guar- anteed for three years from date of original purchase against such mal- function.) 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, appearance items, cables, cable connectors, or switches and does not cover 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, please write: Service Depart- ment, Electro-Voice, Inc., 600 Cecil Street, Buchanan, Michigan 49107 (Phone 616/695-6831 ) or 7473 Avenue 304, Visalia, CA 93277 (209/625-1330,1). Electro-Voice also maintains complete facilities for non-warranty service of E-V products.

****** Page 3 ****** ON SLIDE TO LOCK FIGURE 2—Locking Feature 1800 OFF AXIS & 88äE8g N *ERTZ FIGURE 3—Frequency Response RED HEAD RKEO HEAD TERMINAL 3 RED BLUE MITCH 2 A3F CONNECTOR CABLE RED BLACK GREEN 1 2 3 POSTTIVE PRESSURE ON GENERATING ELEMENT CAUSES POSITIVE VOLTAGE ON WHITE CABLE LEAO OR PIN 2 500 Hz — 2000 Hz FIGURE 4 SET SCREW HOLE Polar Response BLACK (Hi—Z) 2 RED (Lo—Z) FIGURE 5—Wiring Diagram WHITE {PIN 2) SHIELD (PIN 1} a-PIN AUDIO CONNECTOR WHITE BLACK (PIN 3) TIP CONNECTION 110 PHONE PLUG FIGURE 7 FIGURE 6—Changing Impedance SHIELD BLACK SLEEVE CONNECTION 3-Pin Connector & 1/4″ Phone Plug Wiring Connections

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ELECTRO-VOICE 671A (01) PDF MANUAL

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