Model 503BG User Guide
MODEL 503BG
SPECIFICATIONS
Unidirectional Dynamic Microphone
Type
Dynamic, unidirectional (cardioid), close-talking
Frequency Response
100 to 7,000 Hz (Figure 1)
1 cm*
dB
5 cm*
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.
Hz
* distance from speaker to microphone grille
TYPICAL FREQUENCY RESPONSE
FIGURE 1
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.
Impedance
170 ohms actual
Output Level (Open Circuit Voltage)
–61.5 dBV/Pa (.84mV)*
–41.5 dB (8.4 mV)**
*1 Pa = 94 dBSPL
The 503BG’s case is aluminum with a black enamel finish.
It mounts to a gooseneck, a fixed pipe or a microphone stand
using a standard 5/8”-27 thread. To secure the mounted
BG503, tighten the 4-40 screw with the supplied #4 Allen (hex-
head) wrench.
**0 dB = 1V/100 µbar
Polarity
Positive pressure on diaphragm produces positive voltage
on white conductor with respect to black conductor (Figure 2)
Features
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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.
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Constant output over voice spectrum when close
talked.
INTERNAL CONNECTIONS
Humbucking coil minimizes undesirable hum
effects such as CRT interference.
FIGURE 2
Hum Pickup
Low-impedance design permits long cable runs in
extreme hum fields.
Maximum 15 dB equivalent SPL in m0e field
Cable
Small unobtrusive design does not interfere with
CRT visibility.
1.2 m (4 ft) two-conductor shielded
Case
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Rugged and reliable for years of consistent
operation.
Aluminum with black enamel finish; stainless steel
screen.
2007 Shure Incorporated
27C8091 (Rev. 7)
Printed in U.S.A
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