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Polarity
Positive pressure on diaphragm produces positive volt-
age on pin 2 (with respect to pin 3). See Figure 4.
Switch
Built-in magnetic reed on/off switch with lockplate. To
lock switch in th ON position, remove screw on lockplate
and turn lockplate 180 . Reassemble and tighten screw.
Cartridge Shock Mount
lnternal rubber vibration-isolator
Swivel Adapter
Positive action, adjustable through 90 from vertical to
horizontal, permits easy removal for handheld use, suit-
able for mounting on stand with
Case
Chrome-plated die casting with ARMO-DUR grille and
stainless steel screen
Dimensions
See Figure 5
Net Weight (less cable)
255 grams (9 oz)
CERTIFICATIONS
Conforms to European Union directives, eligible to bear
CE marking; meets European Union EMC Immunity Require-
ments (EN 50082–1: 1992).
FURNISHED ACCESSORY
Swivel Adapter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REPLACEMENT PARTS
Cartridge
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Plug Element
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Screen and Grille
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
+10
0
–10
2
20
50
100
TYPICAL FREQUENCY RESPONSE
REED
CARTRIDGE
SWITCH
CODED TERMINAL
GREEN
BLACK
YELLOW
INTERNAL CONNECTIONS
5
/
"–27 thread
8
3
4
5
6
7
8
9
2
3
4
5
6
7
8
9
1000
10000
Hz
FIGURE 2
TRANSFORMER
XLR CONNECTOR
GREEN
RED
BLUE
WHITE
YELLOW
BLACK
BLACK
IMPEDANCE SELECTION SOCKET
(SHOWN IN LOW IMPEDANCE POSITION)
FIGURE 4
OPTIONAL ACCESSORIES
Line Matching Transformer
Desk Stand
Isolation Mount
Dual Mount
Windscreen
Cable, LO–Z (7.6 m [25 ft])
Cable, HI-Z (6.1 m [20 ft])
ARCHITECTS' SPECIFICATIONS
The microphone shall be a moving coil (dynamic) type with
a frequency response of 50 to 15,000 Hz. The unit shall have
a cardioid polar characteristic. 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 be dual impedance
with a rated impedance of 150 ohms for connection to micro-
phone inputs rated at 19 to 300 ohms and "High" for connection
to high–impedance microphone inputs. lmpedance change
shall be solderless at the microphone connector.
The microphone output shall be:
Low lmpedance
(0 dB = 1 volt per Pascal)
High lmpedance
(0 dB = 1 volt per Pascal)
The microphone shall have an XLR, three–pin profession-
al audio connector and shall be equipped with a magnetic reed
On–Off switch.
The microphone shall be provided with a swivel adapter,
adjustable through 90 from vertical to horizontal, and suitable
for mounting on a stand having a
A25D
The overall dimensions of the microphone shall be 157
3
mm (6–
/
16
R45
RK169P
The microphone shall be the Shure Model 545SD-LC or
RK244G
equivalent.
o
150
o
120
o
90
o
60
20000
o
30
32 mm
(1 1/4 in.)
2
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
/
"–27 thread.
8
in.) in length and 31.9 mm (1
o
180
o
150
150
o
120
o
120
o
o
90
90
–20 dB
–15 dB
o
o
60
60
–10 dB
–5 dB
o
30
0
125 Hz
500 Hz
1000 Hz
TYPICAL POLAR PATTERNS
FIGURE 3
157 mm
(6 3/16 in.)
64 mm
93 mm
(2 1/2 in.)
(3 11/16 in.)
OVERALL DIMENSIONS
FIGURE 5
A95 Series
S37A, S39A
A55M
A26M
A2WS
C25J
C20HZ
–58.0 dB
–35.0 dB
1
/
in.) in diameter.
4
o
180
o
o
150
o
120
o
90
–20 dB
–15 dB
o
60
–10 dB
–5 dB
o
o
30
30
0
2000 Hz
4000 Hz
8000 Hz
23 mm
(15/16 in.)
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