General Description
Model 522
Voice Communication Microphone
The Model 522 is a dynamic base-station microphone for radio communications, paging, and dispatching systems. Its cardioid (unidirectional) pickup
pattern suppresses unwanted background noise from nearby dispatchers,
ventilating equipment, or office machines. It also can reduce feedback in
public address paging applications.
Features
• Dual impedance (19 to 300 ohms or High)
• Impedance change switch for convenient change-over
• Finger-tip control bar (locking or non-locking action) to actuate microphone
circuit and an external relay or control circuit
• Long-life swtich to satisfy rigorous requirements of communications and
paging systems
•
Sturdy, high impact ARMO-DUR®, base and microphone case
• Adjustable microphone height
• Dependable under most operating conditions
Press-To-Talk Switch Operation
Press and hold the bar switch to talk. To lock the switch, press and pull it
forward. To unlock the switch, move the bar back and release.
Impedance Selection
Use the switch located under the microphone base, near the cable entry, to
select high (HI) or low (LO) impedance.
Use the low-impedance position for long cable lengths under conditions of
severe hum disturbance. Use Shure Model A95 Series Line Matching
Transformers when using a low-impedance microphone line with a highimpedance amplifier input.
Logic Connections
The RED and BLACK leads may be used to control an external relay or
switching circuit.
Audio Connections
Unbalanced high-impedance operation:
Set the impedance switch to the HI position (as shipped). Connect the GREEN cable lead and the shield to the amplifier chassis ground. The WHITE cable lead
is the "hot" conductor.
Balanced-line low-impedance operation:
Set the impedance switch to the LO position. Connect the shield to the amplifier chassis ground. The WHITE and GREEN cable leads are the "hot" conductors.
Unbalanced SleevePin 3Audio GroundGreen
1/4 in. Phone PlugXLR ConnectorFunctionWire ColorInput Type
TipPin 2AudioWhite
SleevePin 1Chassis GroundShield
1/4©2017 Shure Incorporated
Balanced RingPin 3Audio -Green
Switch
Coded
Terminal
Switch
Action
White
Green
Orange
Green
Yellow
Green
Black
Red
White
Shield
Green
White
Red
Black
Shure IncorporatedModel 522 Voice Communication Microphone
1/4 in. Phone PlugXLR ConnectorFunctionWire ColorInput Type
TipPin 2Audio +White
SleevePin 1Chassis GroundShield
Specifications
Type
Dynamic (moving coil)
Frequency Response
60 to 11,000 Hz
Polar Pattern
Cardioid
Impedance
150 Ω (260 Ω actual)
Sensitivity
at 1kHz, open circuit voltage
-57.5 dB (1.3 mV)LOW
-38.5 dB (12 mV)[1]HIGH
2017/10/102/4
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