Shure BG3.1 Manuel De L'utilisateur page 2

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MODEL BG 3.1
UNIDIRECTIONAL DYNAMIC MICROPHONE
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The BG 3.1 is a high output, vocal microphone designed for
professional sound reinforcement and project studio recording
applications. Its dynamic cartridge features a specially-shaped
frequency response ideal for close-up vocals, and a neodymi-
um magnet for high output level and high signal-to-noise ratio.
The BG3.1 also maintains a uniform cardioid pattern through-
out its frequency range, which ensures high gain-before-feed-
back, maximum isolation from undesired sound sources, and
minimum off-axis sound coloration. Its rugged construction,
dent-resistant steel ball grille, sturdy die-cast handle, and su-
perior shock-mounting system allow the BG3.1 to maintain its
high performance through even the roughest environments.
Typical applications for the BG3.1 include lead vocals, back-up
vocals, and high-profile public address.
GENERAL RULES FOR MICROPHONE USE
1. For optimal signal-to-noise ratio, place the microphone as
close as practical to the desired sound source.
2. For the best gain-before-feedback and isolation from unde-
sired background noise, aim the microphone toward the
sound source and away from undesired sound sources (see
Figure 1). The BG3.1 features a cardioid polar pattern which
is most sensitive to sound directly in front of the microphone,
and least sensitive to sound directly at 180_.
3. For the purest reproduction of sound, use no more than one
microphone per sound source and use the fewest number of
microphones necessary for the application.
4. For maximum isolation, keep the distance between micro-
phones at least three times the distance from each source to
its microphone.
5. Work close to the microphone for extra bass response (see
Figure 2). This phenomenon is known as proximity effect
and can be used to achieve a fuller sound, especially for
vocals during soft passages where extra emphasis is need-
ed. For instruments, proximity effect can be used to change
bass output without using tone controls.
6. Placing the microphone too close to acoustically reflective
(smooth, hard) surfaces will result in a poor frequency
response and will increase the chances for feed back. To
minimize this effect, place microphones as far as possible
from acoustically reflective surfaces.
7. Add an external windscreen when using the microphone
outdoors to reduce wind noise.
8. Do not cover any part of the grille with your hand (see Fig-
ure 3). Covering the grille alters the sound and distorts the
polar pattern, increasing the chances for feedback.
9. It is important to keep foreign particles out of the grille and
the windscreen because they may alter the frequency re-
sponse of the microphone. The grille may be periodically
cleaned using warm, soapy water. Rinse with plain water
and let it dry before replacing.
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