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222 HARTREY AVE., EVANSTON, IL. 60204 U.S.A.
Q
MICROPHONES AND ELECTRONIC COMPONENTS
MODEL 540SH
AREA CODE 3121866-2200
.
CABLE: SHUREMICRO
SONODYNE@ II
TWX: 910- 231-0048
TELEX: 72-4381
I
OMNIDIRECTIONAL DYNAMIC MICROPHONE
GENERAL
The Model 540SH SONODYNEQ II is a dual-
impedance omnidirectional dynamic microphone with
response tailoring capability at both the low and
midrange-to-high frequencies.
As supplied with its extended low and high frequency
response, the microphone is excellent for both music
and voice in public address and recording. In addition,
its tailored response provides highly intelligible speech
reproduction in communications and paging applica-
tions.
The 540SH microphone is designed for stand mount-
ing and has an On-Off switch on the integral positive-
action swivel mount. Solderless impedance change, a
strong detachable cable with a professional three-pin
audio connector, rugged construction, all make the
SONODYNE II a very versatile microphone.
Microphone Features:
Excellent reproduction of voice and music
Omnidirectional pickup pattern, picks up sound all
around
Response tailoring at both low and midrange-to-
high frequencies
m
Solderless impedance change
Built-in On-Off switch, an integral part of the at-
tached, positive-action swivel assembly
Rugged professional three-pin audio connector on
the microphone
Strong, detachable cable especially selected for ef-
fective shielding from hum pickup
Can be used indoors or outdoors, dependable under
all operating conditions
SPECIFICATIONS
TY pe
Dynamic
Polar Pattern
Omnidirectional
lmpedance
Dual. Microphone rating impedance is 150 ohms (230
ohms actual) for connection to microphone inputs
rated at 19 to 300 ohms and "High" for connection to
high-impedance microphone inputs. Wired for low
impedance as supplied. To change impedance, see
sections on lmpedance Selection and Connections.
Output Level (at 1,000 Hz)
IMPEDANCE
Low
High
Open Circuit Voltage*.
. . . . . .
-79.0 dB
-55.0 dB
(.I 12 mV)
(1.78 mV)
Power Level* *
. . . . . . . . . . . .
-
58.5 dB
*O dB
=
1
volt per microbar
* * 0 dB
=
1 milliwatt per 10 microbars
Phasing
Positive pressure on diaphragm produces positive
voltage on pin 2 when connected for low impedance,
on pin
1
when connected for high impedance. (See
Figure
4.)
Frequency Response
50 to 13,000 Hz. Provision for low-frequency rolloff
Switch
and midrange emphasis (see Figure 1)
Built-in On-Off switch, integral part of swivel mount
T Y P I C A L F R E Q U E N C Y R E S P O N S E
FIGURE 1
Cable
4.6m (15 ft) two-conductor shielded, with profes-
sional three-pin female audio connector*
'Designed to mate with Cannon XL series, Switchcraft A3 (Q.G.) Series, or
equivalent connector
Case
Black and silver finish metal and black ARMO-DURQ
Dimensions
See Figure 2
Copyright
1980,
S h u r e Brothers Inc.
2 7 A 1 5 5 5 (TC)
Printed i n U.S.A.
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