CONTROLLED MAGNETICBCOMMUNICATIONS MICROPHONES
222HARTREYAVENUE
SHUeB
EVANSTON, ILLINOIS 80202-3696U.S.A.
THE
SOUNO
OF THE
PAOFESSlONALS~
UlORLWlDE
MICROPHONESAND ELECTRONICCOMPONENTS
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GENERAL
The Shure 401 Series hand-held communications
microphones are compact size, CONTROLLED
MAGNETIC@units designed for clear, crisp, natural
voice response of high intelligibility.
DATA
SHEET
MODELS
401A
and
401
B
Microphone Features:
w
Frequency response from 200 to 4,000 Hz especially
suitable for voice communications use
w
Small, light and compact case, fits comfortably and
firmly in the palm of the hand
w
Extremely sturdy, high impact, ARMO-DUR@case,
lighter and stronger than die-cast metal, comfortable
to the touch in hot or cold weather
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Heavy-duty, long-life,push-to-talkswitch
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Durable rubber-jacketed coil cable
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Ruggedand dependable under all operating conditions
APPLICATIONS
The 401 Series microphones are especially recom-
mended for all types of outdoor-indoor communication
activity: in mobile and fixed station use (as in police,
fire, utility,forestry, and transportation services), and in
commercial and industrial applications-including
radiotelephone, amateur radio, and similar uses. The
microphones are also suitable for indoor and outdoor
public address.
The 401A is a high-impedance microphone with high
output level, making it suitable for connection to high-
impedance amplifier inputs when cable lengths of
15.2m (50 ft) or less are needed.
The 401B is a low-impedance microphone and is
recommended when long cable lengths are required or
under conditions where severe hum pickup may exist.
The 4018 can be connected directly to the input of a
low-impedance amplifier, or a Shure A95 Series Line
Matching Transformer can be used for connecting the
401B to the input of a high-impedance amplifier (addi-
tional connector required).
MOUNTING
A mountingbracket for permanent installationissup-
plied with each microphone. (See Figure
1)
MOUNTING HOLES,
CLEARANCE FOR
No
8
SCREWS
-
10.3
mm
(13/32
IN.)
19.5
mm
34.5
mm
4
(3/8
IN.)
L(1-23/64
IN)
MOUNTING BRACKET
FIGURE
1
CONNECTIONS
The internal switchconnections of the 401A and401B
are shown in Figure
2.
MODEL 401A MODEL 4010
INTERNALCONNECTIONS
FIGURE
2
The 401A is a high-impedance microphone with a
three-conductor, coiled-cord cable (one conductor
shielded), and a double-pole, double-throw switch to
control the microphone circuit and an external relay or
switching circuit. The WHITE lead is the "hot" conduc-
tor for connectiontothe microphone circuit ground. The
RED and BLACK leads control the relay or switching cir-
cuit.
The 4018 isa low-impedancemicrophone with
a
four-
conductor, coiled-cordcable(two conductors shielded),
and a double-pole double-throw switch to control the
microphone circuit and an external relay or switching
circuit. The GREEN and WHITE leads are the "hot" con-
ductors for balanced-lineconnection tothe microphone
circuit; the shield is connected to the microphone cir-
cuit ground. The RED and BLACKleads control the relay
or switching circuit.
Copyright 1993,Shure BrothersInc.
27A198
(MD)
Printedin U.S.A.
