Shure BG Serie Mode D'emploi page 2

MODEL BG4.1
UNIDIRECTIONAL CONDENSER MICROPHONE
The BG4.1 microphone utilizes an advanced condenser
transducer design for use in professional instrument sound re-
inforcement and project studio recording. Its electret cartridge
has a wide frequency response for natural sound reproduction,
and its high sensitivity and low noise make it an ideal choice
for producing quality demo tapes. The BG4.1 also maintains a
cardioid polar pattern throughout its frequency range which en-
sures high gain-before-feedback and maximum isolation from
undesired sound sources. Operating voltage is supplied by
phantom power from a mixer, or an internal AA battery for
10,000 hours of continuous use. Typical applications for the
BG4.1 include acoustic guitar, drums, stringed instruments,
and vocals (when mounted on a stand).
GENERAL RULES FOR MICROPHONE USE
1. For optimal signal-to-noise ratio, place the microphone as
close as possible 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 (Fi-
gure [1]). The BG4.1 features a cardioid polar pattern which
is most sensitive to sound directly in front of the micro-
phone, and least sensitive to sound directly at 180 .
3. For the purest reproduction of sound, use only one micro-
phone per sound source and use the fewest number of mi-
crophones 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. Placing the microphone close to the sound source improves
bass response (Figure [2]). This phenomenon is known as
proximity effect and can be used to achieve a fuller sound,
and to change the bass output of an instrument without us-
ing tone controls. Proximity effect is also especially good
for vocals during soft passages where emphasis is needed.
6. Placing the microphone too close to acoustically reflective
(smooth, hard) surfaces will result in a poor frequency re-
sponse and will increase the chances for feedback. To mini-
mize 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. It is important to keep foreign particles out of the grille and
the windscreen because they may alter the frequency
response of the microphone. Also, avoid exposing con-
denser microphones to heat and high humidity.
SPECIFICATIONS
Type
Condenser (electret bias)
Frequency Response
40 to 18,000 Hz (Figure [2])
Polar Pattern
Cardioid (unidirectional), symmetrical about axis (Figure
[3])
Output Impedance
600 Ω
Recommended Input Load Impedance
800 Ω minimum
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All manuals and user guides at all-guides.com
Output Level (at 1,000 Hz)
Open Circuit Voltage . . . . . . . . . . .
0 dB = 1 V/µbar
Maximum SPL
2,000 Ω load
. . . . . . 131 dB (phantom), 127 dB (battery)
800 Ω load
. . . . . . . . 129 dB (phantom), 126 dB (battery)
Output Noise
20 dB typical, A weighted
24 dB typical, weighted per DIN 45 405
Dynamic Range (maximum SPL, 2 kΩ load, to A-weighted
noise level)
111 dB (phantom); 107 dB (battery)
Polarity
Positive pressure on diaphragm produces positive voltage
on pin 2 relative to pin 3 of microphone output connector
Power
Phantom
Supply Voltage . . . . . . . . . . . . . . . . . .
Current Drain . . . . . . . . . . . .
Reverse polarity protected to
Battery
Recommended . . . . . . . . . .
Life . . . . . . . . . . . . . . . . . . . . . . .
Environmental Conditions
This microphone will operate over a temperature range of –29
o o
to 57 C (–20 to 135 F), and at relative humidity of 0 to 95%.
Switch
Built in On/Off switch
Connector
3-pin male XLR connector designed to mate with Cannon
XL series, Switchcraft A3 (Q.G.) series, or equivalent con-
nector
Case
Steel and brass construction with black painted finish
Dimensions
See Figure [4]
Net Weight
250 g (8.8 oz) less battery
Certification
Conforms to European Union directives, eligible to bear CE
marking; meets European Union EMC Immunity Require-
ments (EN 50 082–1, 1992); RF radiated (IEC 801–3); ESD
(IEC 801–2); EFT (IEC 801–4).
FURNISHED ACCESSORIES
Swivel Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Padded Carrying Case . . . . . . . . . . . . . . . . . . . . . . . . . .
OPTIONAL ACCESSORIES
Phantom Power Supply . . . . . . . . . . . . . . . . . . . . . . . . .
Windscreen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.6 m (25 ft.) Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The BG4.1 is backed by the Shure 2–year warranty. For
service or parts information, please contact the Shure Service
department at 1–800–516–2525. Outside the United States,
please contact your authorized Shure Service Center.
– 68.0 dB (0.400 mV)
11 to 52 Vdc
2.0 mA max at 52 Vdc
. . . . . . . . . . 100 Vdc
1.5 V alkaline AA size
(NEDA 15A)
up to 10,000 hours
A25C
26A16
PS1A
A3WS
C25J
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