MODEL 503BG
Unidirectional Dynamic Microphone
Developed for computer voice recognition applications,
the 503BG microphone offers excellent voice fidelity while
reducing background noise. Also use the 503BG in other
close-talking applications such as paging and talkback.
The 503BG features a low-impedance, moving coil type
transducer with an integral humbucking coil and an attached
two-conductor shielded cable with a built-in strain relief. It
produces a frequency response with an essentially constant
output voltage over the voice spectrum when used close to
the sound source.
The 503BG’s case is aluminum with a black enamel finish.
It mounts to a goos eneck, a fix ed pipe or a microphone stand
using a standard 5/8”-27 thread. To secure the mounted
BG503, tight en the 4-40 screw with the supplied #4 Allen (hex-
head) wr ench.
Features
Optimized performance in voice processing and
computer voice recognition applications.
Smooth frequency response with excellent fidelity
in the voice range.
Cardioid pickup pattern and close-talking opera-
tion keep unwanted signals and background noise
at low levels.
Constant output over voice spectrum when close
talked.
Humbucking coil minimizes undesirable hum
effects such as CRT interference.
Low-impedance design permits long cable runs in
extreme hum fields.
Small unobtrusive design does not interfere with
CRT visibility.
Rugged and reliable for years of consistent
operation.
SPECIFICATIONS
Type
Dynamic, unidirectional (cardioid), close-talking
Frequency Response
100 to 7,000 Hz (Figure 1)
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TYPICAL FREQUENCY RESPONSE
FIGURE 1
Impedance
170 ohms actual
Output Level (Open Circuit Voltage)
–61.5 dBV/Pa (.84mV)*
–41.5 dB (8.4 mV)**
*1 Pa = 94 dBSPL
**0 dB = 1V/100 µbar
Polarity
Positive pressure on diaphragm produces positive voltage
on white conductor with respect to black conductor (Figure 2)
INTERNAL CONNECTIONS
FIGURE 2
Hum Pickup
Maximum 15 dB equivalent SPL in m0e field
Cable
1.2 m (4 ft) two-conductor shielded
Case
Aluminum with black enamel finish; stainless steel
screen.
Model 503BG User Guide
27C8091 (Rev. 7)
2007 Shure Incorporated Printed in U.S.A
1 cm*
5 cm*
dB
Hz
* distance from speaker to microphone grille
Net Weight
128 g (4.5 oz)
Dimensions
See Figure 3
OVERALL DIMENSIONS
FIGURE 3
Operation
For best performance, speak as close to the 503BG as com-
fort permits. A distance of 1 to 5 cm (0.4 to 2 inches) provides
the greatest discriminations between voice and background
noise.
Acoustic Considerations
The 503BG maximizes performance in close-talking applica-
tions through its tailored frequency response, directionality and
distance discrimination. It optimizes and controls sounds within
the 100 to 7000 Hz frequency range and reduces sounds out-
side that range. The BG503 rejects noise through its inherent
directional properties and discriminates against distant sounds
in favor of close- range sounds.
OPTIONAL ACCESSORIES
In-Line On-Off-Momentary Switch A120S. . . . . . . . . . . . . .
12-Inch Gooseneck G12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18-Inch Gooseneck G18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-Inch Gooseneck (Side Vent) G6A. . . . . . . . . . . . . . . . . . . . .
18-Inch Gooseneck (Side Vent) G18A. . . . . . . . . . . . . . . . . . .
12-Inch Gooseneck (Side Vent, 3-Pin Conn.) G12-CN. .
18-Inch Gooseneck (Side Vent, 3-Pin Conn.) G18-CN. .
Mounting Flange A12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heavy-Duty Mounting Flange A13HD. . . . . . . . . . . . . . . . . . .
SHURE Incorporated http://www.shure.com
United States, Canada, Latin America, Caribbean:
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.
Phone: 847-600-2000 U.S. Fax: 847-600-1212 Intl Fax: 847-600-6446
Europe, Middle East, Africa:
Shure Europe GmbH, Phone: 49-7131-72140 Fax: 49-7131-721414
Asia, Pacific:
Shure Asia Limited, Phone: 852-2893-4290 Fax: 852-2893-4055
