Shure SM2 User Manual

GENERAL

The SM2 is a comfortable, self-adjusting headset with dual
enclosed ear receivers and an attached broadcast-quality
boom-mounted microphone. Designed for news and sports
broadcasting, special events remote announcing, interview­ing, and intercom systems, the SM2 permits convenient
hands-free operation

The microphone in the SM2 is a close-talking unidirectional
dynamic type with a response fiom 50 to 15,000 Hz. Because
of its noise-reducing character, it discriminates in favor of
close sounds and against distant sounds. As a result, it can be
used even under extremely noisy conditions without loss or
masking of the voice signal. The microphone boom pivots
through 155º so that the microphone can be correctly posi­tioned at the corner of the mouth either from the left or right
side. A locking thumbscrew prevents the microphone from
slipping or twisting out of place.

The dual earphones have a frequency response of 100 to
8,000 Hz with excellent voice intelligibility for cue, program,
sidetone, or intercom signals. High sensitivity and the en­closed ear feature help to block out room noise and ensure
clarity of the incoming signal. Spring clips on the self-adjust­ing vertical slides and the free-swiveling action of the cush­ioned earpieces assure user comfort even when the headset
is worn for an extended period of time.

An accessory microphone windscreen is provided to protect
against wind noise and explosive breath sounds. The head­set is furnished with a detachable cable having two shielded
conductors for the balanced-line low-impedance microphone
output, and three unshielded conductors for the 2000-ohm
earphones.

Features:

•

Close-talk microphone operation and unidirectional polar
pattern for effective noise reduction

• Smooth, natural microphone voice frequency response

• Microphone can be worn on right or left side, boom pivots

through 155°

• Microphone boom length adjusts through 89 mm

(31/2 in.) range

Model SM2 User Guide

• High sensitivity enclosed ear receivers block out room
noise, enhance clarity of reception

• Self-adjusting, free-swiveling cushioned earpieces pro­mote user comfort, lower fatigue during extended periods
of use

• The Shure guarantee of rugged construction and durability

SPECIFICATIONS

MICROPHONE

Type

Dynamic, Close-Talking

Frequency Response (at 8 mm [5/16 in.])

50 to 15 000 Hz (see F gure 1)

TYPICAL MICROPHONE FREQUENCY RESPONSE

FIGURE 1

Polar Pattern

Cardioid (unidirectional) response-uniform with frequency,
symmetrical about axis (see Figure 2)

TYPICAL POLAR PATTERN

FIGURE 2

Impedance

Microphone rating impedance is 150 ohms (200 ohms
actual) for connection to microphone inputs rated at
19 to 300 ohms

2003, Shure Incorporated
27B2183 (CA)

US patent 4,039, 765

Printed in U.S.A.

Microphone Sensitivity (close-talked at 1,000 Hz)

Open Circuit Voltage............ – 47.0 dBV/Pa* (4.5 mV)

*1 Pa=94 dB SPL

Hum Sensitivity (typical)

38.4 dB equivalent SPL in 1 m0e field

Polarity

Positive pressure on diaphragm produces positive voltage
on RED cable lead with respect to BLACK cable lead

RECEIVERS

Type

Dynamic

Frequency Response

100 to 8,000 Hz

Impedance

2,000 ohms at 1 kHz

Output Level (at each ear)

104.0 dB SPL with 1.4V at 1 kHz (1.0 mW into 6 cc cavity)

Polarity

Positive voltage on WHITE and/or YELLOW cable leads
produces positive pressure at receiver

boom in the pivot housing. Pivot and slide the microphone
until it is located as close as possible to the outside corner
of the mouth (not directly in front.) Tighten the thumscrew.

INTERNAL CONECTIONS

FIGURE 3
GENERAL
Cable

2m (6.5 ft) detachable, five conductor (two conductors
shielded), with 6-pin threaded connector to mate with con­nector on headset

Construction Material

Soft durable covered steel headband, chrome-plated steel
receiver brackets, soft durable covered padded earpieces,
black thermoplastic microphone housing, stainless steel
grille and boom.

Dimensions

See Figure 4

Net Weight (less cable)

290 grams (10.2 oz)

CERTIFICATION

Eligible to bear CE Marking. Conforms to European EMC Directive
89/336/EEC. Meets applicable tests and performance criteria in Eu­ropean Standard EN55103 (1996) parts 1 and 2, for residential (E1)
and light industrial (E2) environments.

POSITIONING THE MICROPHONE

Put on the headset with the microphone boom on the de­sired side. Adjust the earpiece extensions by putting down
or pushing up until the headset is most confortable. Loosen
the thumbscrew holding the microphone.

WARNING

Sustained high volume levels may adversely affect the
user’s hearing. Make sure the volume is set to a very
low level before putting on the headset. Then gradual­ly raise the volume to a confortable listening level.

REPLACEMENT PARTS

Microphone Cartridge R93. . . . . . . . . . . . . . . . . . . . . . .

Receiver Cartridge 90EX2600. . . . . . . . . . . . . . . . . . . . . . . . .

Microphone Windscreen RK184WS. . . . . . . . . . . . . . . . . . . . .

Cable C108. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Earpad 90FY2600. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SHURE Incorporated Web Address: http://www.shure.com
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.
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