IMPEDANCE SELECTION-
RECEPTACLE END OF MICROPHONE
FIGURE 4
INTERNAL CONNECTIONS
FIGURE 5
CONNECTIONS
When using the microphone in low impedance, the
cable conductors from connector pins 2 and 3 are the audio
signal carriers. Connect the shield to amplifier or chassis
ground.
When using the microphone in high impedance, the
cable conductor from pin 3 and the shield are the audio sig-
nal carriers. Connect the conductor from pin 3 to the “hot”
amplifier input; connect the shield to amplifier or chassis
ground. An unused lead attached to pin 2 should be insu-
lated before attaching a connector to a two-conductor
shielded bare-ended cable.
PHASING
To test two microphones and/or their cables for proper
phasing, connect them to an amplifier and talk or sing into
them while holding them three or four inches apart. The
sound from the speakers should be the same when talking
into either microphone or directly between them if they are
in phase with each other. If the sound drops drastically, or if
a dead spot is found when talking between the two micro-
phones, either the microphones or their cables (low imped-
ance only) are out of phase. All cables and microphones
should be tested in this manner to ensure that they are in
phase with each other.
To change the phase of a low-impedance microphone
cable, either use a Shure A15PRS Phase Reverser or inter-
change the wires connected to pins 2 and 3 of the connector.
To change the phase of a microphone, the microphone car-
tridge leads must be interchanged (see Figure 5). This
should be performed by your dealer, the Shure Factory Ser-
vice Department, or other qualified service personnel.
FURNISHED ACCESSORY
Swivel Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A25E
OPTIONAL ACCESSORIES
Line Matching Transformer . . . . . . . . . . . . . . . A95 Series
Desk Stand
. . . . . . . . . . . . . . . . . . . . . . . . . . . S37A, S39P
Isolation Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A55M
Dual Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A25M
Windscreen
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2WS
Cable, LO-Z (6.1 m - 20 ft) . . . . . . . . . . . . . . . . . . . . C20H
Cable, LO-Z (6.1 m - 20 ft, mic connector only) . . C20D
Cable, HI-Z (6.1 m-20 ft) . . . . . . . . . . . . . . . . . . . . . C2OP
REPLACEMENT PARTS
545D-LC
545SD-LC 545SD-CN
Cartridge
R45
R45
R45
. . . . . . . . . . . . . .
—
C20H
Plug Element
RK169P
RK169P
RK169P
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
the rear shall be 15 to 20 dB. The microphone shall be dual
impedance with a rated impedance of 150 ohms for connec-
tion to microphone inputs rated at 19 to 300 ohms and “High”
for connection to high-impedance microphone inputs. Impe-
dance change shall be solderless at the microphone con-
nector.
The microphone output shall be:
Low Impedance . . . . . . . . . . . . . . . . . . . . . . . . . .
(0 dB = 1 milliwatt per 10 microbars)
High Impedance. . . . . . . . . . . . . . . . . . . . . . . . . . .
(0 dB = 1 volt per microbar)
audio connector.* Models 545SD-CN and 545SD-LC shall
The microphone shall be provided with a swivel adapter,
able 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 545D-LC,
545SD-CN, 545SD-LC or equivalent.
*Designed to mate with Cannon XL series, Switchcraft
A3 (Q.G.) series or equivalent connector
The Sound of Professionals...Worldwide™
Shure Brothers Incorporated
222 Hartrey Avenue, Evanston IL 60202-3696
