Shure Microphone Model 550L User Manual

Shure Brothers Incorporated  
222 Hartrey Avenue  
Evanston IL 60202-3696 U.S.A.  
Model 550L User Guide  
Reliability plus—under all operating conditions  
Neoprene feet prevent microphone slipping  
PRESS-TO-TALK SWITCH OPERATION  
The fingertip control bar is a non-locking switch;  
simply depress the control bar and release after trans-  
mission.  
CONNECTIONS  
Figure 1 shows the internal wiring of the 550L  
microphone. The 550L is designed for balanced-line,  
low-impedance operation. The WHITE and GREEN  
cable leads are the two conductors for the microphone  
circuit; the shield is connected to the amplifier or chas-  
sis ground. The RED and BLACK leads control an ex-  
ternal relay or switching circuit.  
MODEL 550L  
OMNIDIRECTIONAL DYNAMIC  
BASE STATION MICROPHONE  
TRANSMIT  
The Shure 550L is a dynamic base station micro-  
phone with a frequency response specially tailored for  
voice intelligibility. It is equally useful for radio commu-  
nications, paging and dispatching systems, and its  
low-impedance connection makes it adaptable to most  
PA amplifiers. The low-impedance design also makes  
itusefulforlongruns, orunderseverehumdisturbance  
conditions.  
RED  
BLACK  
WHITE  
GREEN  
SHIELD  
RED  
ORANGE  
The microphone is not affected by heat or humidity.  
Its exclusive ARMO-DURR case is immune to oil,  
grease, fumes, salt spray, sun, rust, and corrosion  
—and is outstanding in its ability to resist mechanical  
shocks and vibration. The “Million-Cycle” leaf-type  
switch is designed to withstand rigorous operating  
conditions and constant use.  
INTERNAL CONNECTIONS  
FIGURE 1  
Low-impedance operation is extremely useful  
where long cable lengths are required, or under condi-  
tions of severe hum disturbance. The permissible  
cable length is practically unlimited, since neither re-  
sponse nor level is appreciably affected. Shure A95  
Series Line Matching Transformers are available for  
use in those cases where a low-impedance micro-  
phone is to be used with an amplifier with a high-  
impedance input. These transformers provide a proper  
impedance match between a 19- to 300-ohm micro-  
phone and a high-impedance input, and are available  
with various input and output connectors.  
Features  
Low-impedance operation for long cable runs or  
severe hum disturbance  
Crisp, natural, high-intelligibility voice response  
Fingertip control bar actuates microphone circuit  
and external relay or control circuit  
Long-life switch meets rigorous requirements of  
communications and paging systems  
Sturdy, high-impact ARMO-DUR base and micro-  
phone case—impervious to corrosion  
E1998, Shure Brothers Incorporated  
27A8090 (RB)  
Printed in U.S.A.  
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