Shure Microphone 503BG User Manual

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  
S
S
S
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.  
S
S
S
S
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  
S
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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