Shure 27C687 Leaflet

27C687 (Rev. 6)

Printed in U.S.A.

©2012 Shure Incorporated

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. 

•  Dual impedance (19 to 300 ohms or High)
•  lmpedance 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 switch 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 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.

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 high-

impedance amplifier input.

The RED and BLACK leads may be used to control an external relay or 

switching circuit.

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.

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.

WHITE

AUDIO

PIN 2

TIP

GREEN

AUDIO 

GROUND

PIN 3 

SLEEVE

SHIELD

CHASSIS 

GROUND

PIN 1

SLEEVE

WHITE

AUDIO +

PIN 2

TIP

GREEN

AUDIO –

PIN 3

RING

SHIELD

CHASSIS 

GROUND

PIN 1

SLEEVE