Shure_Beta_57A_User_Guide 电路图.pdf
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1、MODEL BETA 57A SUPERCARDIOID DYNAMIC PERFORMANCE MICROPHONE GENERAL The Shure BETA 57A is a high output supercardioid dynamic microphone designed for professional sound reinforcement and project studio recording. It maintains a true supercardioid pattern throughout its frequency range. This insures
2、high gain before feedback, maximum isolation from other sound sources, and minimum offaxis tone coloration. A completely new grille design lets you take better advantage of proximity effect. The BETA 57A is an exceptionally versatile microphone. Typical applications include drums, guitar amplifiers,
3、 brass, woodwinds and vocals. FEATURES Tailored frequency response provides drums, guitars, vocals, and horns with studio quality sound Uniform supercardioid pattern for high gain before feed- back and superior rejection of offaxis sound Hardened steel mesh grille that facilitates use of proximity e
4、ffect and resists wear and abuse Neodymium magnet for high signaltonoise ratio output Minimally affected by varying load impedance Advanced pneumatic shock mount system that minimizes transmission of mechanical noise and vibration Legendary Shure quality and reliability GENERAL RULES FOR MICROPHONE
5、USE 1. Aim the microphone toward the desired sound source and away from unwanted sources. Since supercardioid micro- phones such as the BETA 57A have narrow pickup patterns and can pick up sounds from the rear, this may not be ob- vious or intuitive. Refer to Figure 1. 2. Place a microphone as close
6、 as practical to the desired sound source (refer to the table in the facing column). 3. Work close to the microphone for extra bass response. 4. Use only one microphone to pick up one sound source. 5. Keep the distance between microphones at least three times the distance from a microphone to a soun
7、d source. 6. Use the fewest number of microphones as is practical. 7. Place mics as far as possible from reflective surfaces. 8. Add a windscreen when using the microphone outdoors. 9. Avoid excessive handling to minimize pick up of mechanical noise. APPLICATIONS AND PLACEMENT The most common applic
8、ations and placement techniques for the BETA 57A are listed in the following table. Keep in mind that microphone technique is largely a matter of personal tastethere is no one “correct” microphone position. APPLICATIONSUGGESTED MICROPHONE PLACEMENT TONE QUALITY TomTomsOne BETA 57A on each tom, or be
9、tween each pair of toms, 2.5 to 7.5 cm (1 to 3 in.) above drum heads. Aim each mic at top drum heads. On double head toms, you can also remove bottom head and place a mic inside, pointing up to- ward top head. Medium attack, balanced sound. Medium attack, balanced sound. Snare Drum2.5 to 7.5 cm (1 t
10、o 3 in.) above the rim of the top drum head. Aim the mic at the drum head. If desired, place a second mic just below rim of bottom head. Most “snap” from drumstick impact More “snare” sound. Guitar emphasized bass. Sharp attack; higher frequency sound. Medium attack; full, balanced sound. Softer att
11、ack; thin, reduced bass sound. Vocals2.5 to 15 cm (1 to 6 in.) from the vocalists mouth. Rich, warm sound. Brass no los coloque directamente detrs de ste (vea la Figura 1). Siempre compruebe la disposicin del escenario antes de una ejecucin para verificar que la colocacin de micrfonos y altoparlante
12、s es la ptima. 180 120120 90 0 ALTOPARLANTE(S) DE MONITOREO ALTOPARLANTE DEL SISTEMA DE REPRODUCCION 90 COLOCACION RECOMENDADA DE ALTOPARLANTES FIGURA 1 ESPECIFICACIONES Tipo Dinmico (bobina mvil) Respuesta de frecuencia 50 a 16.000 Hz (vea la Figura 2) 0 +10 10 0.6 m 51 mm 3 mm 25 mm 5001,0002,0005
13、,00010,000501002002020,000 Hz dB RESPUESTA DE FRECUENCIA TIPICA FIGURA 2 NOTA: La curva abajo ilustrada muestra la respuesta de una fuente sonora uniforme colocada en el eje de captacin a una distancia de 0,6 m. La respuesta obtenida en la prcti- ca variar segn la posicin del micrfono. Patrn polar S
14、upercardioide, simtrico respecto al eje del micrfono, uniforme respecto a la frecuencia (vea la Figura 3) 10000 Hz 6300 Hz 2500 Hz 1000 Hz 500 Hz 250 Hz PATRONES DE CAPTACION POLAR TIPICOS FIGURA 3 Nivel de salida (a 1.000 Hz) Voltaje en circuito abierto: 51 dBV/Pa* (2,8 mV) *1 Pa = 94 dB SPL Impeda
15、ncia La impedancia nominal es de 150 ? (real: 290 ?) para cone- xin a entradas de micrfono de baja impedancia (baja Z) Fasaje Una presin positiva en el diafragma del micrfono produce un voltaje positivo en la clavija 2 con respecto a la clavija 3 Conector Conector de audio de tres clavijas profesion
16、al (tipo XLR ma- cho) Caja Metal troquelado pintado de color plateado azul con rejilla de acero endurecido con acabado mate Adaptador ajustable para pedestal Ajustable a travs de 180? con rosca estndar de 5/8”27 Peso neto 275 g Certificaciones Califica para llevar las marcas CE. Cumple la directiva
17、europea 89/336/EEC de compatibilidad electromagntica. Se ajusta a los criterios correspondientes de verificacin y funcionamiento establecidos en la norma europea EN 55103 (1996), partes 1 y 2, para zonas residenciales (E1) y zonas de industria ligera (E2). ACCESORIOS SUMINISTRADOS Adaptador para ped
18、estal ajustableA25D. . . . . . . . . . . . . . . . Adaptador de roscas de 5/8 a 3/8 pulg (Euro)95A2050. . . Bolsa de almacenamiento26A21. . . . . . . . . . . . . . . . . . . . . . . ACCESORIOS OPCIONALES Pantalla magntica contra vientoA57AWS. . . . . . . . . . . . . . Montaje de pedestal aislanteA55
19、M, A55HM. . . . . . . . . . . . . Cable de 7,6 mC25E, C25F. . . . . . . . . . . . . . . . . . . . . . . . . . REPUESTOS CartuchoR174. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Conjunto de rejillaRK320. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Conjunto
20、 de enchufe (conector)90F1984. . . . . . . . . . . . . . . . 9 MODELLO BETA 57A MICROFONO DINAMICO A SUPERCARDIOIDE PER PRESTAZIONI PROFESSIONALI INTRODUZIONE Il modello Beta 57A della Shure un microfono dinamico a supercardioide ad uscita elevata, realizzato per applicazioni in studi di registrazio
21、ne ed impianti di amplificazione profes- sionali. La caratteristica di ricezione a supercardioide rimane invariata in tutto il campo di frequenza del microfono, assicu- rando cos un elevato guadagno a monte della retroazione, massimo isolamento acustico e minima colorazione dei toni fuori asse. Una
22、realizzazione completamente nuova della gri- glia consente di sfruttare meglio leffetto di prossimit. Il mo- dello Beta 57A un microfono eccezionalmente versatile. Ap- plicazioni tipiche includono esecuzioni con batteria, chitarre, amplificatori, ottoni, legni e puramente vocali. CARATTERISTICHE ? R
23、isposta in frequenza ottimizzata per ottenere da batterie, chitarre, cantanti e ottoni suono di qualit professionale. ? Diagramma di ricezione a supercardioide uniforme, che presenta un elevato guadagno a monte della retroazione ed una reiezione superiore dei suoni fuori asse. ? Griglia in acciaio t
24、emprato che facilit luso delleffetto di prossimit e resiste allusura e agli abusi. ? Magnete al neodimio, per ottenere un elevato rapporto segnale/rumore alluscita. ? Bassa sensibilit a variazioni dellimpedenza di carico. ? Avanzato sistema di montaggio antivibrazione pneumatico, che riduce al minim
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