General Description

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 high-impedance 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.

Cable-to-Connector Wiring

Input Type	Wire Color	Function	XLR Connector	1/4 in. Phone Plug
Unbalanced	White	Audio	Pin 2	Tip
	Green	Audio Ground	Pin 3	Sleeve
	Shield	Chassis Ground	Pin 1	Sleeve
Balanced	White	Audio +	Pin 2	Tip
	Green	Audio -	Pin 3	Ring
	Shield	Chassis Ground	Pin 1	Sleeve

Specifications

Type

Dynamic (moving coil)

Frequency Response

60 to 11,000 Hz

Polar Pattern

Cardioid

Output Impedance

Dual. "Low" is 260 ohms for connection to microphone inputs rated at 19 to 300 ohms and "High" for connection to high-impedance microphone inputs.

Sensitivity

at 1kHz, open circuit voltage, dependent on impedance setting

LOW	-57.5 dB (1.3 mV)
HIGH	-38.5 dB (12 mV)^[1]

Switch

Press-to-Talk Switch	lockable, for microphone and an external relay or control circuit. Microphone circuit normally shorted in both high and low impedance.
Impedance Selection Switch	provides either high- or low-impedance operation.

Cartridge Shock Mount

Internal rubber vibration isolator

Cable

2.1 m (7 ft) four-conductor, two conductors shielded non-detachable

Housing

Two-tone gray ARMO-DUR, with dull-chrome-plated steel screen

Weight

736 g (1 lb 10 oz.)

^[1]1 Pa = 94 dB SPL

Typical Polar Pattern

Typical Frequency Response

Overall Dimensions

Accessories

Replacement Parts

Cable	C31C
On-Off Switch	K141S

Certifications

This product meets the Essential Requirements of all relevant European directives and is eligible for CE marking.

The CE Declaration of Conformity can be obtained from: www.shure.com/europe/compliance

Authorized European representative:

Shure Europe GmbH

Headquarters Europe, Middle East & Africa

Department: EMEA Approval

Jakob-Dieffenbacher-Str. 12

75031 Eppingen, Germany

Phone: +49-7262-92 49 0

Fax: +49-7262-92 49 11 4

Email: info@shure.de