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2 2 2 HARTCEY AVE., EVANSTON. I L . 6 0 2 0 4 U.S.A.
DATA
SHEET
MODEL ES50
AREA CODE 3 1 2 / 3 2 8 - 9 0 0 0
.
CABLE: SHUREMICRO
UNIDIRECTIONAL DYNAMIC MICROPHONE
FOR ACOUSTICALLY EQUALIZED SOUND
General: The basic role of the microphone in an equal-
ized sound system is to pick up the program source
without disturbing the uniformly distributed sound-
adjustment which has been performed on the system.
The feedback threshold, measured in half-octave
bands, gives an overall picture of the performance
potential of the microphone used in an equalized sound
system. This measurement includes the effects of fre-
quency response and polar response.
The design of the Model ES50 microphone has
been specifically optimized to operate in equalized
sound systems and to maintain a uniform feedback
threshold characteristic.
The feedback threshold curve of the Model ES50
is shown in Fig. A.
NOTE that the feedback threshold in the useful
operating range of 110 Hz. to 5000 Hz. is main-
tained at uniform level. This factor is imperative
for optimum results from an equalized system at
minimal costs. In the critical range above 5000 Hz.
the response of the ES50 has been smoothly
tailored to increase the feedback rejection in this
region.
A further requirement of a microphone for use in
an equalized system is its uniform phasing-the
Model
ES50 is 100% phase checked.
The microphone features:
m
Response specially tailored for use in equalized
sound systems
True cardioid pickup pattern: symmetrical about
axis and uniform at all frequencies
Cartridge shock mounted for quiet operation
Versatility-for
use in the hand or on a stand
8
An adjustable swivel adapter that enables you to
aim the microphone where you want it. Swivel
also allows for quick removal for use as a hand
microphone
The Model ES50 is low impedance and is designed
for connection to a 25 to 200 ohm line or input. This is
recommended where long cable lengths are required
or where there are conditions of severe hum disturb-
ance. To use Model ES50 with a high impedance ampli-
fier, use a Shure Model A95A Line Matching Trans-
former.
FURNISHED ACCESSORIES
Swivel Adapter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A25B
OPTIONAL ACCESSORIES
Line Matching Transformer
. . . . . . . . . . . . . . . . . .
A95A
Vi bration-Isolation Stand
. . . . . . . . . . . . . . . . . . . .
S39A
Desk Stand
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S33B
Quick Disconnect Isolation Unit
. . . . . . . . . . . . . . . .
A47
ARCHITECT'S SPECIFICATIONS
The microphone shall be Shure Model ES50 or equiv-
alent. A moving coil (dynamic) microphone with a fre-
quency and polar response especially tailored for
equalized sound systems, this unit shall have a cardioid
polar characteristic. The feedback threshold measured
in half-octave bands, shall be uniform from 110-5000
Hz. Above 5000 Hz, its response shall be peak free
and smoothly rolled off. The cancellation at the sides
shall be approximately 6 db and the cancellation at
the rear shall be 15 to 20 db. The microphone shall have
an impedance of 150 ohms for connecting into micro-
phone inputs rated at 25 to 200 ohms. The microphone
output shall be:
150 ohms impedance
-
60.0 db
(0 db
=
1 milliwatt with 10 microbars)
The microphone rating Gm (sensitivity) at 1000 Hz.
shall be
-
153.0 db
EIA Standard SE-105, August 1949
The microphone shall be provided with an adjustable
swivel adapter. The microphone swivel adapter shall
mount on a stand having a 518"-27 thread. The overall
dimensions shall be 6-5/16 inches (160.3 mm) in length
and 1-15/32 inches (37.3 mm) in diameter.
Copyright 1969, Shure Brothers Inc.
27A550
(LD)
(OVER)
U.S.
Patents, 3,132,713 and 3,240,833
Printed
in U.S.A.
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