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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, interview-
ing, 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 posi-
tioned 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 en-
closed ear feature help to block out room noise and ensure
clarity of the incoming signal. Spring clips on the self-adjust-
ing vertical slides and the free-swiveling action of the cush-
ioned 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 head-
set 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
• High sensitivity enclosed ear receivers block out room
noise, enhance clarity of reception
• Self-adjusting, free-swiveling cushioned earpieces pro-
mote 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
Model SM2 User Guide
27B2183 (CA)
2003, Shure Incorporated
Printed in U.S.A.
US patent 4,039, 765