2
Impedance
Microphone rating impedance is 150 ohms (270 ohms
actual) for connection to microphone inputs rated at 75
to 300 ohms
Sensitivity (at 1,000 Hz)
Open Circuit Voltage
–58.0 dBV/Pa (1.3 mV)
. . . . . . . .
1 Pascal=94 dB SPL
Polarity
Positive pressure on the diaphragm produces positive
voltage on pin 2 relative to pin 3 of the output connector
Switch
Built–in On/Off switch, integral part of swivel mount,
connector Three pin professional type, designed to
mate with Cannon XL series, Switchcraft A3 (Q.G.) se-
ries, or equivalent
Case
Chrome–plated die casting
Dimensions
See Figure 3
OVERALL DIMENSIONS
FIGURE 3
Net Weight
624 grams (22 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.
POLARITY
To test two microphones and their cables for common
polarity, 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 have
common polarity. If the sound level drops drastically, or if a
dead spot is found, when talking between the two micro-
phones, either the microphones or their cables have differ-
ent polarity. All cables and microphones can be tested in this
manner to ensure that they have common polarity.
To reverse the polarity of a low–impedance microphone
cable, use either a Shure A15PRS Switchable Phase Re-
verser or interchange the wires connected to pins 2 and 3 of
the connector. To reverse the polarity of a microphone, inter-
change the cartridge leads (see Figure 4.) This should be
performed by your dealer, the Shure Factory Service De-
partment, or other qualified service personnel.
CARTRIDGE
SWITCH
XLR CONNECTOR
BLACK
YELLOW
CODED TERMINAL
BLUE
YELLOW
BLACK
1
2
3
INTERNAL CONNECTIONS
FIGURE 4
OPTIONAL ACCESSORIES
Desk Stand
S37A, S39A
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Line Matching Transformer
A85F, A95UF
. . . . . . . . . . . . . .
Cable and Plug Assembly
C25B, C25E, C25J
. . . . . . . . . .
REPLACEMENT PARTS
Cartridge R115
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On/Off Switch
RK32S
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Plug Element
RK169P
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
For additional service or parts information, please con-
tact Shure’s Service department at 1-800-516-2525 or
www.shure.com. Outside the United States, please contact
your authorized Shure Service Center.
SHURE Incorporated Web Address: http://www.shure.com
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.
Phone: 800-257-4873 Fax: 847-866-2279
In Europe, Phone: 49-7131-72140 Fax: 49-7131-721414
In Asia, Phone: 852-2893-4290 Fax: 852-2893-4055
Elsewhere, Phone: 847-866-2200 Fax: 847-866-2585
