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Polarity
Positive pressure on diaphragm produces positive voltage 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 the ON position, remove screw on lockplate and turn
lockplate 180°. Reassemble and tighten screw.
Cartridge Shock Mount
Internal rubber vibration-isolator
Swivel Adapter
Positive action, adjustable through 90° from vertical to horizon-
tal, permits easy removal for handheld use, suitable for mount-
ing on stand with 5/8"–27 thread
Case
Chrome-plated die casting with ARMO-DUR
®
grille and stain-
less steel screen
Dimensions
See Figure 5
Net Weight (less cable)
255 grams (9 oz)
CERTIFICATION
Eligible to bear CE Marking. Conforms to European EMC Directive
89/336/EEC. Meets applicable tests and performance criteria in
European Standard EN55103 (1996) parts 1 and 2, for residential
(E1) and light industrial (E2) environments.
FURNISHED ACCESSORY
Swivel Adapter ..................................................................A25D
REPLACEMENT PARTS
Cartridge .............................................................................. R45
Plug Element................................................................. RK169P
Screen and Grille ..........................................................RPM210
TYPICAL FREQUENCY RESPONSE
FIGURE 2
OPTIONAL ACCESSORIES
Line Matching Transformer........................................A95 Series
Desk Stand .............................................................S37A, S39A
Isolation Mount .................................................................. A55M
Dual Mount ........................................................................A26M
Windscreen ............................................................. A2WS-GRA
Cable, LO–Z (7.6 m [25 ft]).................................................C25J
Cable, HI–Z (6.1 m [20 ft])............................................... C20HZ
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 microphone 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 .............................................................-58.0 dB
(0 dB = 1 volt per Pascal)
High lmpedance ............................................................-35.0 dB
(0 dB = 1 volt per Pascal)
The microphone shall have an XLR, three-pin professional 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 5/8"–27 thread.
The overall dimensions of the microphone shall be 157 mm (6-3/16
in.) in length and 31.9 mm (1 1/4 in.) in diameter.
The microphone shall be the Shure Model 545SD-LC or
equivalent.
TYPICAL POLAR PATTERNS
FIGURE 3
20 200001000 1000050 100
98765432
98765432
+10
0
-- 10
Hz
dB
150
o
120
o
150
o
120
o
180
o
30
o
60
o
90
o
30
o
60
o
90
o
--5 dB
--10 dB
--15 dB
--20 dB
0
150
o
120
o
150
o
120
o
180
o
30
o
60
o
90
o
30
o
60
o
90
o
--5 dB
--10 dB
--15 dB
--20 dB
0
125 Hz
500 Hz
1000 Hz
2000 Hz
4000 Hz
8000 Hz
CARTRIDGE TRANSFORMER XLR CONNECTOR
CODED TERMINAL
IMPEDANCE SELECTION SOCKET
(SHOWN IN LOW IMPEDANCE POSITION)
REED
SWITCH
GREEN
BLACK
YELLOW
GREEN
YELLOW
BLACK
RED
BLUE
WHITE
BLACK
(1 1/4 in.)
32 mm
157 mm
(6 3/16 in.)
23 mm
(15/16 in.)
64 mm
(2 1/2 in.)
94 mm
(3 11/16 in.)
INTERNAL CONNECTIONS
FIGURE 4
OVERALL DIMENSIONS
FIGURE 5