3
POWERING THE 93 MICROPHONE
The 93 impedance conversion circuitry is designed to be
powered, as shown in Figure 3, from a regulated +5 Vdc
source provided at microphone connector pin 2 from a
Shure wireless body-pack transmitter or from the pream-
plifier supplied with the SM93. If the WL93 is to be used
with any other wireless transmitter, either the microphone
cable or the transmitter input must be rewired for proper
operation and powering within the constraints of the
Rec-
ommended Operating Voltage
and
Current Drain
specifi-
cations.
NOTE: The WL93 microphone alone is not designed to
be operated directly into the input of a mixer.
MICROPHONE WIRING DIAGRAM
FIGURE 3
1
3
2
CONDENSER
CARTRIDGE
IMPEDANCE
CONVERTER
G
SHIELD
BLK
RED
S
D+
4
POWERING THE SM93 AMPLIFIER
The SM93 with its supplied preamplifier can be powered
by virtually any microphone phantom supply providing 11
to 52 Vdc phantom voltage. The Shure Model PS1A Pow-
er Supply provides power to one or two SM93 micro-
phones. Phantom powering uses the balanced audio
cable pair to carry the supply current to the microphone;
the cable shield is the ground return.
Use only high-quality cables. Intermittent shorts be-
tween broken shield wires and balanced conductors will
cause objectionable noise transients in the system. A reli-
able ground path is essential for the same reason.
LOADING THE SM93 PREAMPLIFIER
A minimum load impedance of 800 Ω or greater should
be used for maximum signal handling and minimum distor-
tion. The load can be as low as 150 Ω, but a reduction in
output clipping level will result. It should be noted that the
power supply itself may add loading (3300 Ω in the Shure
PS1A) to the microphone.
MOUNTING THE SM93 PREAMPLIFIER
Most SM93 applications require that the preamplifier be
worn on the body. The spring-loaded belt clip will hold the
amplifier to a belt, skirt or trouser waistband or inside
pocket.
WINDSCREENS
Since lavalier microphones are typically used indoors,
they normally do not require windscreens. However, an
acoustic foam windscreen( WL93, SM93: black; WL93T:
tan) is supplied to help reduce undesirable wind noise as-
sociated with outdoor miking.
MOUNTING THE MICROPHONE
The tie clips and mounting bracket provided with the
WL93 and SM93 are very small and designed to minimize
visual detection. They allow the user to wear the micro-
phone in a variety of ways, including the following:
1. Tie Clip. The microphone tie clip features a spring-
loaded clasp that attaches easily to a necktie, lapel,
blouse, or shirt. To mount the 93 to the tie clip, snap the
microphone into the clip’s mounting bracket and attach
the clip to an article of clothing). The SM93 is also sup-
plied with a dual tie clip for simultaneous mounting of
two microphones.
2. Sew-On Bracket. The flat sew-on mounting bracket
provided with the 93 can be sewn directly to a garment
(Figure 4). The use of dark thread (for WL93 or SM93)
or light thread (WL93T) is recommended when sewing
the bracket to clothing.
SEW–ON MOUNTING
FIGURE 4
THREAD
BRACKET
MICROPHONE
GARMENT
NOTE
:
Other mounting methods can be devised from
materials such as tape, hook-and-loop fasteners, or safe-
ty pins available at most fabric or hardware stores.
3. WL93T. The tan color of the WL93T housing, cable and
accessories, plus its longer-length cable enhance its
use in theater productions where the 93 may be tape-
mounted on the skin or under the hair.
FURNISHED ACCESSORIES
Preamplifier (SM93) 90A4360. . . . . . . . . . . . . . . . . . . . . .
Black Windscreen (WL93, SM93) RK355WS*. . . . . . . . .
Black Tie Clip Assembly (WL93, SM93) RK354SB*. . . .
Dual Black Tie Clip Assembly (SM93) RK307DB. . . . . . .
Tan Windscreen (WL93T) RK304T**. . . . . . . . . . . . . . . . .
Tan Tie Clip Assembly (WL93T) RK304T**. . . . . . . . . . . .
Black Sew-on Mounting Bracket (WL93, SM93) 65B1733. .
Tan Sew-on Mounting Bracket (WL93T) 65B1733A. . . .
Zippered Carrying Bag 26A13. . . . . . . . . . . . . . . . . . . . . . .
∗ Replacements furnished in multiples of 4.
** RK304 incluses 2 tie clips and 2 windscreens.
OPTIONAL ACCESSORIES
In-Line On/Off Switch WA360. . . . . . . . . . . . . . . . . . . . . . .
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General
Weight and Dimensions
