Shure BETA 87C Bedienungsanleitung
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Model BETA 87C™ User Guide
©2006, Shure Incorporated
27C3109 (Rev. 4)
Printed in U.S.A.
BETA 87C™
Cardioid Condenser Microphone
The Shure BETA 87C is a high output condenser microphone
that provides touring professionals with studio-quality sound.
Vocalists who use earphone monitor systems such as the Shure
PSM® Personal Monitor System will appreciate how effectively the
BETA 87C rejects ambient sound from the rear of the microphone.
The BETA 87C maintains its cardioid pattern throughout its fre-
quency range, ensuring maximum isolation from other sound
sources and high gain before feedback. Its warm, natural sound is
the result of an exceptionally smooth frequency response that in-
cludes a slight presence rise. A controlled low-frequency roll-off
compensates for proximity effect and prevents the “boomy“ sound
often associated with close-up use.
The BETA 87C is an excellent choice for professional studio re-
cording, yet it is built to withstand the rigors of touring. It maintains
its performance characteristics even at sound pressure levels as
high as 139 dB SPL. Plus, the cartridge is protected by a proven
shock mount system. A hardened steel mesh grille with a built-in
pop filter provides added protection.
Features:
• Smooth, wide frequency response with slight presence rise
• Cardioid polar pattern for maximum isolation
• Minimal off-axis tone coloration
• Superior gain before feedback
• Low-frequency roll-off compensates for proximity effect
• Wide dynamic range (117 dB)
• Low distortion characteristics
• Very low susceptibility to RFI and electromagnetic hum
• Advanced cartridge shock-mount system absorbs mechanical
shocks and reduces handling noise
• Built-in pop filter reduces wind and breath sounds
• Shure ruggedness and reliability for years of trouble-free
performance
APPLICATION AND PLACEMENT
The BETA 87C is ideal for applications where earphone monitor
systems such as the Shure PSM® personal monitor systems are
used. Tone quality will vary, depending on how close the micro-
phone is to the sound source. Keep in mind that microphone tech-
nique is largely a matter of personal taste–-there is no one “correct”
microphone position.
General Rules for Microphone Use
1. Aim the microphone toward the desired sound source and
away from unwanted sources. Refer to Figure 1.
2. Place the microphone as close as practical to the desired
sound source. For extra bass response, work close to the
microphone. Refer to the table above.
3. Use only one microphone for each sound source.
4. Keep the distance between microphones at least three times
the distance from each source to its microphone.
5. Place microphones as far as possible from reflective surfaces.
6. Use the fewest number of microphones as is practical.
7. Add a windscreen when using the microphone outdoors.
8. Avoid excessive handling to minimize pick up of mechanical
noise and vibration.
9. Do not cover any part of the grille with your hand.
CARDIOID MICROPHONE POSITIONING
FIGURE 1
OPERATION
Power
The BETA 87C requires phantom power. This may be supplied
to the microphone from an external power supply (such as the
Shure model PS1A) or directly from preamplifiers, mixers, or con-
soles with built-in phantom power. Suitable sources should provide
11 to 52 Vdc phantom voltage.
SUGGESTED MICROPHONE
PLACEMENT
TONE QUALITY
Lips less than 15 cm (6 in.) away or
touching the windscreen, on axis to
microphone.
Robust sound, emphasized
bass, maximum isolation from
other sources.
15 to 60 cm (6 in. to 2 ft.) away from
mouth, just above nose height.
Reduced bass.
More than 60 cm (2 ft.) away. Thinner, distant sound; notice-
able levels of ambient noise.
180°
90°
0°
90°
STAGE
MONITOR
P.A.
LOUDSPEAKERS
MICROPHONE SOUND
SOURCE
2
Proximity Effect
Unidirectional microphones such as the BETA 87C progressive-
ly boost bass frequencies by 10 to 15 dB at 100 Hz when the mi-
crophone is at a distance of about 6 mm (1/4 in.) from the sound
source. This phenomenon, known as proximity effect, can be used
to create a warmer, more powerful sound. To prevent excessive or
“boomy” low frequency sound during close-up use, the BETA 87C
bass response gradually rolls off. This provides greater control and
helps the user take advantage of proximity effect.
Wind Noise
The BETA 87C has an integral wind and pop filter which pro-
vides excellent protection against most wind and breath noise. Un-
der adverse conditions, such as high winds or close proximity to a
“problem” vocalist, the optional foam windscreen can be used.
Impedance
A minimum load impedance of 800 ohms should be used for
maximum signal handling and minimum distortion. The load may
be as low as 150 ohms, but a reduction in output level and output
clipping level will result.
SPECIFICATIONS
Transducer Type
Condenser (electret bias)
Frequency Response
50 to 20,000 Hz (see Figure 2)
TYPICAL FREQUENCY RESPONSE
FIGURE 2
Polar Pattern
cardioid (see Figure 3)
TYPICAL POLAR PATTERN
FIGURE 3
Output Impedance
Rated at 150 ohms (100 Ohms actual ±20%)
Recommended minimum load impedance: 800 ohms
Sensitivity (at 1,000 Hz)
Open Circuit Voltage . . . . . . . . . . . . . –51 dBV/Pa (2 mV)
(1 Pa = 94 dB SPL)
Output Clipping Level
1000 Ohm Load at 1,000 Hz . . . . . . . –6 dBV (0.5 V)
Maximum SPL
139 dB at 1,000 Hz (0.25% THD, 1000 Ohm load)
Self-Noise
22 dB typical, A-weighted
24 dB typical, weighted per DIN 45 405
(equivalent sound pressure level; measured with true rms volt-
meter)
Dynamic Range
117 dB (maximum SPL to A-weighted noise level)
Hum Sensitivity
–5 dB equivalent SPL, maximum, in a 1 mOe field (60 Hz)
Signal-to-Noise Ratio
72 dB at 94 dB SPL (IEC 651)*
*S/N ratio is difference between 94 dB SPL and equivalent SPL of self-
noise A-weighted.
Polarity
Positive pressure on diaphragm produces positive voltage on
pin 2 relative to pin 3 of the output connector. See Figure 4.
BETA 87C BLOCK DIAGRAM
FIGURE 4
Power
Phantom Supply Requirement . . . . 11 to 52 Vdc, positive
at both pins 2 and 3
Current Drain. . . . . . . . . . . . . . . . . . . . . . . . . 1.0 to 1.2 mA
Connector
Three-pin (XLR) professional audio
Case
Aluminum construction with painted blue metallic finish, and
hardened steel grille with nickel satin chrome plating
Dimensions
See Figure 5
OVERALL DIMENSIONS
FIGURE 5
Net Weight
Net: 207 grams (7.6 oz)
Packaged: 565 grams (1.24 lbs)
Environmental Conditions
Operating: –18° ° ° ° to 60 C (0 to 135 F)(relative humidity <90%)
Storage: –29° ° ° ° to 74 C (–20 to 165 F) (relative humidity <80%)
CAPACITOR
(ELECTRET)
CONDENSER)
CARTRIDGE
BLUE
GREEN
FET
IMPEDANCE
CONVERTER
LF
RESPONSE
FILTER
CLASS A
COMPOUND
AMPLIFIER
REGULATOR
REVERSE
VOLTAGE
PROTECTOR
BALANCED
TRANSFORMER
RFI
FILTER
21 mm
(53/64 in.)
51 mm
(2 in.)
192 mm
(7– 9
/16 in.)
3
CERTIFICATION
Eligible to bear CE Marking. Conforms to European EMC Direc-
tive 89/336/EEC. Meets applicable tests and performance criteria
in European Standard EN55103 (1996) parts 1 and 2, for residen-
tial (E1) and light industrial (E2) environments.
FURNISHED ACCESSORIES
Swivel Adapter...............................................................A25D
Carrying/Storage Bag .................................................. 26B21
OPTIONAL ACCESSORIES
Phantom Power Supply................................................. PS1A
Isolation Mount................................................ A55M, A55HM
Windscreen ................................................................ A85WS
7.6 m (25 ft.) Cable ........................................................C25F
REPLACEMENT PARTS
Grille............................................................................ RK312
Cartridge Assembly...................................................RPM118
Replacement Amplifier Assembly ..........................90KF2600
FRANÇAIS
MODÈLE BETA 87C ™
MICROPHONE ÉLECTROSTATIQUE CARDIOÏDE
Le Shure BETA 87C est un microphone électrostatique à haut
niveau de sortie qui permet aux professionnels en tournée d'obte-
nir une qualité sonore digne d'un enregistrement en studio. Les
chanteurs qui utilisent des systèmes de contrôle par écouteur in-
terne tels que le système de retour personnel Shure PSM® ap-
précieront l'efficacité avec laquelle le BETA 87C rejette le son
ambiant de l'arrière du microphone.
Le BETA 87C maintient en fait une vraie configuration cardioïde
dans toute sa gamme de fréquences, ce qui assure une isolation
maximum des autres sources de bruits et un gain élevé avant Lars-
en. Il doit sa reproduction sonore chaude et naturelle à une
réponse en haute fréquence exceptionnellement uniforme incluant
une légère hausse de présence. Une coupure de basse fréquence
contrôlée compense l'effet de proximité et évite le son «tonitruant»
souvent associé au captage de près.
Le BETA 87C représente un excellent choix pour les enregistre-
ments en studio professionnels, tout en étant conçu pour supporter
les rigueurs des tournées. Il maintient ses caractéristiques de per-
formances, même à des niveaux de pression acoustique allant
jusqu'à 139 dB NPA. En outre, la capsule est protégée par un
système antichocs éprouvé. Une grille en acier trempé à filtre anti-
bruit incorporé assure une protection supplémentaire.
Avantages :
• Large plage de réponse en fréquence uniforme à légère hausse
de présence
• Courbe de directivité cardioïde uniforme pour une isolation
maximum
• Coloration désaxée de tonalité minimale
• Gain supérieur avant Larsen
• Coupure de basse fréquence compensant l'effet de proximité
• Large gamme dynamique (117 dB)
• Faible distorsion
• Très basse susceptibilité aux radiofréquences et ronflements
lectromagnétiques
• Système antichocs de capsule absorbant les chocs mécaniques
et réduisant les bruits de manipulation
• Filtre anti-bruit incorporé réduisant les bruits de vent et de
respiration
• Robustesse et fiabilité de Shure garantissant de nombreuses
années de fonctionnement sans incidents
APPLICATIONS ET PLACEMENT
Le BETA 87C est idéal pour les applications dans lesquelles des
systèmes de contrôle par écouteur interne tels que les systèmes
de retour personnel Shure PSM® sont utilisés. La qualité de la to-
nalité varie en fonction de la proximité du microphone par rapport
à la source sonore. Ne pas oublier que la façon d'utiliser un micro-
phone est souvent une question de goût personnel et qu'il n'existe
aucune position de microphone «correcte» à proprement parler.
Règles générales d'utilisation du microphone
1. Diriger le microphone vers la source sonore désirée et à
l'opposé des sources sonores indésirables. Voir la figure 1.
2. Placer le microphone le plus près possible de la source
sonore. Pour obtenir davantage de graves, placer le
microphone le plus près possible de la source sonore. Voir le
tableau ci-dessus.
3. Utiliser un seul microphone pour chaque source sonore.
4. La distance entre les microphones doit être d'au moins trois
fois celle de chaque source au microphone qui lui est affecté.
5. Placer les microphones le plus loin possible des surfaces
réfléchissantes.
6. Utiliser un minimum de microphones dans la mesure du
possible.
7. Si le microphone est utilisé à l'extérieur, le munir d'une
bonnette anti-vent.
8. Éviter de manipuler le microphone outre mesure afin de
minimiser le captage des bruits mécaniques et des vibrations.
9. Ne couvrir aucune partie de la grille avec la main.
POSITIONNEMENT D'UN MICROPHONE CARDIOÏDE
FIGURE 1
PLACEMENT SUGGÉRÉ DU
MICROPHONE
QUALITÉ DE LA TONALITÉ
Lèvres à moins de 15 cm de la
bonnette anti-vent ou la touchant,
dans l'axe du microphone.
Son puissant, graves
accentués, isolation maximum
par rapport aux autres
sources.
15 à 60 cm de la bouche. Graves atténués.
Éloignement de 60 cm Son plus ténu et distant,
niveaux sensibles de bruit
ambiant.
180°
90°
0°
90°
HAUT-PARLEURS
RETOUR
MICROPHONE SOURCE
SONORE
Produktspezifikationen
Marke: | Shure |
Kategorie: | Mikrofon |
Modell: | BETA 87C |
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