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MODEL BG2.1
UNIDIRECTIONAL DYNAMIC MICROPHONE
The BG2.1 is a dynamic vocal microphone designed
for quality sound reinforcement and project studio record-
ing applications. Its dynamic cartridge features a smooth
frequency response tailored for close-up vocals, and a
neodymium magnet for high output level and high signal-
to-noise ratio. The BG2.1 also maintains a uniform cardi-
oid pattern throughout its frequency range, which ensures
high gain-before-feedback, maximum isolation from unde-
sired sound sources, and minimum off-axis sound color-
ation. Its rugged construction, dent-resistant tapered
grille, sturdy die-cast handle, and proven shock-mounting
system allow the BG2.1 to maintain its excellent perfor-
mance through even the roughest environments. Typical
applications for the BG2.1 include close-up vocals, instru-
ment pickup, public address, and high-profile karaoke.
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
undesired background noise, aim the microphone to-
ward the sound source and away from undesired sound
sources (see Figure 1). The BG2.1 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 mi-
crophones 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, espe-
cially for vocals during soft passages where extra em-
phasis is needed. For instruments, proximity effect can
be used to change bass output without using tone con-
trols.
6. Placing the microphone too close to acoustically reflec-
tive (smooth, hard) surfaces will result in a poor frequen-
cy 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 micro-
phone outdoors to reduce wind noise. The A58WS
windscreen is available in 7 different colors.
8. Do not cover any part of the grille with your hand (see
Figure 3). Covering the grille alters the sound and dis-
torts the polar pattern, increasing the chances for feed-
back.
9. It is important to keep foreign particles out of the grille
and the windscreen because they may alter the fre-
quency response of the microphone. The grille may be
periodically cleaned using warm, soapy water. Rinse
with plain water and let it dry before replacing.
SPECIFICATIONS
Type
Dynamic
Frequency Response
80 to 15,000 Hz (see Figure 2)
Polar Pattern
Cardioid (unidirectional), symmetrical about axis (see
Figure 4)
Output Impedance
Microphone Rated impedance is 150 Ω (290 Ω actual)
for microphone inputs rated 75 to 300 Ω
Output Level (at 1,000 Hz)
Open Circuit Voltage* – 54.0 dBV ( .200 mV). . . . . .
*1 Pascal = 94 db SPL
Polarity
Positive pressure on diaphragm produces positive
voltage on pin 2 relative to pin 3 of the microphone out-
put connector.
Environmental Conditions
This microphone will operate over a temperature
range of –29 to 57
o
C (–20 to 135
o
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 Can-
non XL series, Switchcraft A3 (Q.G.) series, or equiva-
lent.
Case
Die cast zinc handle, black matte finish, dent-resist-
ant tapered grille
Dimensions
See Figure 5
Net Weight
296 g (10.5 oz)
Certification
Eligible to bear CE Marking. Conforms to European
EMC Directive 89/336/EEC. Meets applicable tests
and performance criteria in European Standard
EN55103 (1996) parts 1 and 2, for residential (E1)
and light industrial (E2) environments.
FURNISHED ACCESSORIES
Storage Bag 26A13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Break-Resistant Swivel Adapter A25D. . . . . . . . . . . . . . .
4.57 m (15 ft.) XLR-to-XLR cable 90J3860. . . . . . . . . . . .
OPTIONAL ACCESSORIES
Shock Stopper
TM
Isolation Mount A55M. . . . . . . . . . . . . .
Windscreen (7 colors available) A58WS Series. . . . . . . .
7.6 m (25 ft) Cable (XLR to XLR) C25J. . . . . . . . . . . . . . .
REPLACEMENT PARTS
Dent-Resistant Grille Assembly RK350G. . . . . . . . . . . . .
Cartridge Assembly R194. . . . . . . . . . . . . . . . . . . . . . . . . .
The BG2.1 is backed by the Shure 2-year warranty.
For service or parts information, please contact the Shure
Service department. Outside the United States, please
contact your authorized Shure Service Center.
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