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PDF ( 数据手册 , 数据表 ) BETA58A

零件编号 BETA58A
描述 Microphone user guide
制造商 Shure
LOGO Shure LOGO 


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BETA58A 数据手册, 描述, 功能
Model BETA 58AR User Guide
www.DataSheet4U.com
MODEL BETA 58AR
SUPERCARDIOID DYNAMIC VOCAL MICROPHONE
GENERAL
The Shure BETA 58A is a high-output supercardioid dy-
namic vocal microphone designed for professional sound re-
inforcement and project studio recording. It maintains a true
supercardioid pattern throughout its frequency range. This
insures high gain before feedback, maximum isolation from
other sound sources, and minimum off–axis tone coloration.
The BETA 58A has a shaped frequency response that is
ideal for close–up vocals. The superb performance of this
microphone is not affected by rough handling because of its
rugged construction, proven shock mount system, and hard-
ened steel mesh grille. Typical applications for the BETA 58A
include lead vocals, backup vocals and speech.
FEATURES:
S Frequency response tailored for vocals, with brightened
midrange and bass rolloff to control proximity effect
S Uniform supercardioid pattern for high gain before
feedback and superior rejection of off–axis sound
S Neodymium magnet for high signal–to–noise output
S Hardened steel mesh grille that resists wear and abuse
S Advanced pneumatic shock mount system that minimizes
transmission of mechanical noise and vibration
S Minimally effected by varying load impedance
S Legendary Shure quality and reliability
2003, Shure Incorporated
27B2796 (Rev. 3)
APPLICATION AND PLACEMENT
The BETA 58A is designed for close-up vocals, and can be
hand held or mounted on a stand. Some of the most common
applications and placement techniques are listed in the fol-
lowing table. Keep in mind that microphone technique is
largely a matter of personal taste—there is no one “correct”
microphone position.
SUGGESTED MICROPHONE
PLACEMENT
TONE QUALITY
Lips less than 15 cm (6 in.) away Robust sound, emphasized
or touching the windscreen, on bass, maximum isolation from
axis to microphone.
other sources.
15 to 60 cm (6 in. to 2 ft.) away Natural sound, reduced bass.
from mouth, just above nose
height.
20 to 60 cm (8 in. to 2 ft.) away Natural sound, reduced bass
from mouth, slightly off to one and minimal ”s” sounds.
side.
90 cm to 1.8 m (3 to 6 ft.) away. Thinner, distant sound; notice-
able levels of ambient noise.
GENERAL RULES FOR MICROPHONE USE
1. Aim the microphone toward the desired sound source and
away from unwanted sources. Since supercardioid micro-
phones such as the BETA 58A have narrow pickup pat-
terns and can pick up sounds from the rear, this may not
be obvious or intuitive.
2. Place the microphone as close as practical to the desired
sound source. Refer to the table above.
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 each source to its microphone.
6. Use the fewest number of microphones as is practical.
7. Place microphones as far as possible from reflective sur-
faces.
8. Add a windscreen when using the microphone outdoors.
9. Avoid excessive handling to minimize pickup of mechani-
cal noise and vibration.
10. Do not cover any part of the grille with your hand.
PROXIMITY EFFECT
Unidirectional microphones such as the BETA 58A progres-
sively boost bass frequencies by 6 to 10 dB at 100 Hz when
the microphone is at a distance of about 6 mm (1/4 in.) from
the sound source. This phenomenon, known as proximity ef-
fect, can be used to create a warmer, more powerful sound.
To prevent explosive low frequency sound during close–up
use, the BETA 58A bass response gradually rolls off. This pro-
vides greater control and helps the user take advantage of
proximity effect.
Printed in U.S.A.







BETA58A pdf, 数据表
ESPECIFICACIONES
Tipo
Dinámico (bobina móvil)
Respuesta de frecuencia
50 a 16.000 Hz (vea la Figura 2)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ+10
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ3mm
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ25mm
0
51 mm
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ–10
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ0.6m
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁwww.DataSheet4U.com
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ20 50 100 200
500
1,000
2,000
5,000
10,000 20,000
FRECUENCIA EN HZ
RESPUESTA DE FRECUENCIA TIPICA
FIGURA 2
NOTA: La curva abajo ilustrada muestra la respuesta de
una fuente sonora uniforme colocada en el eje de capta-
ción a una distancia de 0,6 m. La respuesta obtenida en
la práctica variará según la posición del micrófono.
Patrón polar
Supercardioide, simétrico respecto al eje del micrófono,
uniforme respecto a la frecuencia (vea la Figura 3)
150o
120o
180o
150o
120o
150o
120o
180o
150o
120o
90o
60o
30o
–20 dB
–15 dB
–10 dB
–5 dB
30o
0
250 Hz
500 Hz
1000 Hz
90o 90o
60o 60o
30o
–20 dB
–15 dB
–10 dB
–5 dB
30o
0
2500 Hz
6300 Hz
10000 Hz
90o
60o
PATRONES DE CAPTACION POLAR TIPICOS
FIGURA 3
Nivel de salida (a 1.000 Hz)
Voltaje en circuito abierto: –51,5 dBV/Pa* (2,6 mV)
*1 Pa = 94 dB SPL
Impedancia
La impedancia nominal es de 150 W (real: 290 W) para cone-
xión a entradas de micrófono de baja impedancia (baja Z)
Fasaje
Una presión positiva en el diafragma del micrófono produce
un voltaje positivo en la clavija 2 con respecto a la clavija 3
(Vea la Figura 4).
AZUL
VERDE
ROJO
AMARILLO
CONEXIONES INTERNAS
FIGURA 4
Caja
Metal troquelado pintado de color plateado azul con rejilla
esférica de acero endurecido con acabado mate
Adaptador para pedestal ajustable
Ajustable a través de 180_ , irrompible, con rosca estándar
de 5/8”–27 y acabado en negro
Dimensiones (Vea la Figura 5)
50 mm
Peso neto
278 g
160 mm
DIMENSIONES TOTALES
FIGURA 5
Certificaciones
Califica para llevar las marcas CE. Cumple la directiva eu-
ropea 89/336/EEC de compatibilidad electromagnética.
Se ajusta a los criterios correspondientes de verificación
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 ajustable para pedesta . . . . . . . . . . . . . . . A25D
Adaptador de roscas de 5/8 a 3/8 pulg (Euro) . . 95A2050
Bolsa de almacenamiento . . . . . . . . . . . . . . . . . . . . . 26A21
ACCESORIOS OPCIONALES
Paravientos . . . . . Serie A58WS (disponible en 8 colores)
Montaje con aislamiento . . . . . . . . . . . . . . . A55M, A55HM
Cable de 7,6 m . . . . . . . . . . . . . . . . . . . . . . . . . C25E, C25F
REPUESTOS
Cartucho . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . R176
Conjunto de rejilla . . . . . . . . . . . . . . . . . . . . . . . . . . RK265G
Conjunto de enchufe (conector) . . . . . . . . . . . . . . 90F1984
8














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