Shure Microphone 450 Series II User Manual

Model 450 Series II User Guide  
WIRING CONNECTIONS  
Refer to Figure 1 and Table 1 below. For unbalanced opera-  
tion, the GREEN wire is connected to the audio input, the  
WHITE wire is connected to the audio ground, and the  
SHIELD is connected to chassis ground. In some cases, au-  
dio ground and chassis ground will be the same.  
For balanced operation, the GREEN wire is connected to the  
positive audio input, the WHITE wire is connected to the  
negative audio input, and the SHIELD is connected to chas-  
sis ground.  
IMPEDANCE SWITCH  
PRESS-TO-TALK SWITCH  
GREEN YELLOW  
1
2
3
LO  
HI  
BLACK  
RED  
GREEN  
WHITE  
BLACK  
SHURE MODEL 450 SERIES II  
SHIELD  
PAGING AND DISPATCHING MICROPHONE  
ORANGE  
RED  
The Shure Model 450 Series II is a high output dynamic mi-  
crophone designed for paging and dispatching applications.  
This extremely rugged microphone features an omnidirec-  
tional pickup pattern and a frequency response tailored for  
optimum speech intelligibility. It also includes an impedance  
selection switch and a locking press-to-talk switch. The  
press-to-talk switch can be converted to a monitor/transmit  
switch with the Shure RK199S Split-Bar Conversion Kit.  
WIRING DIAGRAM  
FIGURE 1  
Table 1. Typical Cable-to-Connector Wiring  
INPUT TYPE  
WIRE  
COLOR  
FUNCTION  
XLR  
1/4 IN.  
CONNECTOR PHONE JACK  
GREEN  
WHITE  
SHIELD  
AUDIO  
PIN 2  
PIN 3  
PIN 1  
TIP  
Features  
UNBALANCED  
AUDIO GROUND  
CHASSIS GROUND  
SLEEVE  
SLEEVE  
Dual impedance  
Locking press-to-talk switch  
R
GREEN  
WHITE  
SHIELD  
AUDIO +  
AUDIO –  
PIN 2  
PIN 3  
PIN 1  
TIP  
Rugged ARMO-DUR base and case  
BALANCED  
RING  
Adjustable height  
CHASSIS GROUND  
SLEEVE  
Optional monitor/transmit switch conversion kit  
PRESS-TO-TALK SWITCH OPERATION  
NOTE: The RED and BLACK leads are not part of the audio  
circuit. These wires provide a contact closure when the press-  
to-talk switch is depressed. This closure may be used to con-  
trol an external relay or a transmit/receive circuit.  
To operate the control bar as a press–to–talk switch, simply  
hold it down and begin speaking. When you are finished  
speaking, release the control bar.  
CHANGING PTT CIRCUIT TO NORMALLY OPEN  
To lock the control bar in the “on” position, press it down and  
pull it forward. To unlock the control bar, push it back and re-  
lease it.  
Using microphones in parallel requires a normally open mi-  
crophone circuit. To modify the press–to–talk switch so that  
it provides a normally open circuit, proceed as follows:  
IMPEDANCE SELECTION  
1. Remove the screws, washers, and bottom plate from  
the microphone.  
To select high or low impedance, move the impedance selec-  
tion switch, located under the microphone base, to either the  
HIGH or LO position. The switch is factory pre–set to LO.  
2. Unsolder the black, red, and white leads from the terminal  
of the press–to–talk switch (see Figure 1). Make  
sure these leads are still soldered together. If necessary,  
resolder them and insulate the connection.  
Shure recommends the low impedance setting if long  
lengths of cable are used, or if severe hum is encountered.  
Use Shure A95 Line Matching Transformers to match a low  
impedance (300 ) microphone line to a high impedance  
amplifier input.  
3. Replace the bottom plate and secure it with the screws  
and washers removed in Step 1.  
2005, Shure Incorporated  
27C2917 (Rev. 3)  
Printed in U.S.A.  
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