Shure Brothers Incorporated
222 Hartrey Avenue
Evanston IL 60202-3696 U.S.A.
Model WM98 and SM98A User’s Guide
MODEL WM98 AND SM98A MINIATURE CONDENSER MICROPHONES
The WM98 is supplied with a versatile shock–mount swivel
MICROPHONE
adapter for mounting on a standard 5/8”–27 thread, a 1.47 m (5
ft) cable with miniature 3– and 4–pin connectors (Switchcraft TA3
and TA4 types), and an acoustic foam windscreen to minimize
wind noise in outdoor applications and from air–moving equip-
ment.
POLAR
MODIFIER
The Shure ILP-1, low-distortion high-clipping-level, phantom–
powered preamplifier, is furnished with the SM98A microphone.
Additional included accessories are: a windscreen for use with
the microphone alone, and a windscreen for use with the
A98SPM, a shock-mount swivel adapter and a detachable 4.6 m
(15 ft) cable with Switchcraft “Tini Q–G” connectors.
SWIVEL
ADAPTER
The ILP-1 preamplifier provides switchable gain of 0 or +10 dB
and switch-selectable Flat or Low-Cut response to suit pickup for
various instruments. The Low-Cut position is also useful to filter
out low-frequency noise from such sources as wind noise or air
conditioner or heater fans. The ILP-1 can be powered by any 11–
to 52–volt dc phantom supply from sound reinforcement, record-
ing, or broadcast equipment.
PREAMPLIFIER
GENERAL
Shure Models WM98 and SM98A are miniature electret con-
denser microphones with a unidirectional (cardioid) pickup pat-
tern. A smooth wide frequency response from 40 to 20,000 Hz
makes the microphones well suited for musical instrument pick-
up. The WM98 is for wireless use; the SM98A is for wired applica-
tions. Both models feature the 98 microphone element.
The cardioid polar response of the 98 discriminates against
sounds coming from the rear, permitting higher gain before feed-
back in sound reinforcement applications. With its true cardioid
pattern extending to 20,000 Hz, the microphone can often be
used for pickup of a particular instrument in an ensemble or or-
chestra.
When still stronger rejection of off-axis pickup is required, the
A98SPM Supercardioid Polar Modifier should be used. This de-
vice changes the pickup pattern from cardioid to supercardioid
with minimal change of on-axis microphone frequency response.
With the A98SPM, the 98 becomes the smallest multi-pattern mi-
crophone available, eliminating the need for costly multiple cap-
sules. The A98SPM is supplied with the SM98A.
Optional accessories, designed exclusively for use with the
WM98 and SM98A, are available. These include the following:
•
•
A98MK Drum Kit, with gooseneck holder and clamp for
mounting the microphone directly on most drums.
A98KCS Horn Mount, a shock-mounted clamp designed es-
pecially for securely mounting the 98 on a horn, wind, or reed
instrument.
Microphone Features:
•
Smooth, wide frequency response for accurate sound repro-
duction across the entire audio spectrum
•
Symmetrical cardioid pattern, uniform with frequency to 20
kHz
•
•
•
Very high sound pressure level capability
Very low distortion and high output clipping level
Low susceptibility to RFI, electrostatic and electromagnetic
hum
•
Smallest multi-pattern microphone available – without the
need for multiple capsules
A very high maximum sound pressure level allows use of the
98 with all acoustic instruments including drum kits and other per-
cussion as well as brass, reed, wind, string, and keyboard instru-
ments. The 98 can also be used with amplified guitars and key-
boards.
TheWM98canbeconnecteddirectlytoaShurewirelesstrans-
mitter using the supplied cable; other transmitters must be
checked for proper pin configuration, condenser microphone
power supply, and connector type.
•
•
Rugged construction for outstanding reliability
Cable detachable at both microphone and transmitter
(WM98) or preamplifier (SM98A)
Usable over very wide range of temperature and humidity
Supplied with unique shock-mount swivel adapter for mount-
ing on conventional microphone stands or goosenecks
Optional accessories to increase microphone versatility
•
•
•
TYPICAL FREQUENCY RESPONSE – SM98A WITH
A98SPM POLAR MODIFIER INSTALLED
FIGURE FIGURE 4
TYPICAL FREQUENCY RESPONSE
FIGURE FIGURE 3
E1998, Shure Brothers Incorporated
1
Printed in U.S.A.
27A2738 (RI)
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Dimensions
See Figure 5
31.8 mm
(1-1/4 in.)
98 MICROPHONE
11.9 mm
(15/32 in.)
138 mm
(5-7/16 in.)
20 mm
(13/16 in.)
CABLE RETAINED IN GUIDE
FIGURE 8
ILP–1 PREAMPLIFIER (SM98A)
5. Tilt the adapter to aim the microphone as desired.
WM98: 1.52 m (5 ft)
SM98A: 4.6 m (15 ft)
6. To remove the microphone without disturbing the swivel adapt-
er and cable, reach into the open slot of the adapter and press
the cable-lock button while disengaging the microphone.
TA4F
(WA330)
TA3F
PREAMPLIFIER PERMANENT MOUNTING (SM98A)
OVERALL DIMENSIONS
The supplied mounting clamps are intended to hold the pre-
amplifier in place in permanent installations (see Figure 9). Use
either one or two clamps depending on location and application.
FIGURE 5
1.0 µF
V out
100 K
20 K
5V
3
1
4
2
+
–
WM98 STANDARD TEST CIRCUIT
FIGURE 6
INSTALLATION
MOUNTING CLAMPS – SM98A PREAMPLIFIER
FIGURE 9
To mount the 98 in the supplied swivel adapter:
1. Mount the adapter on a microphone stand.
2. Attach the microphone to the connector.
PREAMPLIFIER SWITCHES
The preamplifier case contains two miniature recessed slide
switches. In the Lo Cut position, the Flat/Lo Cut switch provides
a 12 dB rolloff below 80 Hz (see Figure 1). The effects of the 0/+10
dB Gain switch are described in the Preamplifier Output Clipping
Level specifications.
3. Slip the cable through the slot in the adapter. Slide the connec-
tor back through the hole until the protruding black cable lock
button is in the open slot and the back of the microphone itself
stopsflushwiththefrontoftheholder. Onlythesilvermetalseg-
ment of the connector is held by the holder (see Figure 7).
INSTALLING THE A98SPM
The A98SPM Supercardioid Polar Modifier is supplied with
the SM98A . To mount the microphone in an A98SPM Polar Modi-
fier, proceed as follows.
IMPORTANT
The white internal element of the A98SPM is essential
to maintaining the supercardioid polar pattern. Do not
remove it!
1. Unscrew the rear support from the front support by turning the
rear support counterclockwise (from bottom). See Figure 10.
2. Insert the microphone (cable not connected) into the rear sup-
port with its connector end contacting the support.
3. Attach the front and rear supports together by turning the rear
support clockwise (from bottom). Tightensufficiently to prevent
rattling.
SWIVEL ADAPTER MOUNTING
FIGURE 7
CAUTION
Do not overtighten. Damage to the internal element
may result.
4. Slide the cable through the slot in the cable guide and make a
large loop (see Figure 8). Then route the cable away from the
stand to prevent transmission of noise and vibration through
the cable.
3
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REASSEMBLING THE PREAMPLIFIER (SM98A)
1. Make sure the pc board is seated in the slot of the end cap and
that no wires are pinched.
2. Inserttheendcap-boardassemblyintothecase, XLRconnect-
ing wires first. Again, take care not to pinch the wires connect-
ing the board to the end cap.
REAR
SUPPORT
CABLE AND
CONNECTOR
MICROPHONE
FRONT
SUPPORT
A98SPM ASSEMBLY
3. RotatetheassemblyinsidethecaseuntilthefourholesforPhil-
lips screws line up with the holes in the case.
FIGURE 10
4. Replace the four Phillips screws.
4. Mount the swivel adapter on the microphone stand.
5. Attach the microphone cable to the 98-A98SPM.
5. Resolder the three lead wires to the back of the XLR board as
shown in Figure 11.
6. Mount the Microphone-Polar Modifier combination in the
adapter as in steps 3 through 5 of the Installation section.
2
1
7. To remove the microphone assembly from the swivel adapter
without disturbing the adapter and cable, reach into the open
slot of the adapter and press the cable-lock button while disen-
gaging the microphone.
3
BLACK
RED
BLUE
NOTE: The Microphone-Polar Modifier assembly can be used
with or without its supplied acoustic foam windscreen. When
mountedontheSM98A-A98SPM, thewindscreennotonlypro-
vides excellent wind and pop protection, but helps protect the
A98SPM internal element from contamination.
WIRING TO XLR PC BOARD TERMINALS
FIGURE 11
6. Replace the XLR board-connector assembly in the case, lining
up the key in the connector with the slot in the case. Take care
not to engage the butterfly-shaped ground contact in the key
slot as it will prevent seating the connector properly.
DISASSEMBLING THE PREAMPLIFIER (SM98A)
1. At the XLR connector end of the preamplifier, turn the slotted
head setscrew fully inward (counterclockwise), and use a long-
nose pliers to carefully withdraw the connector from the case.
7. Insert the connector fully in the case until the slotted setscrew
can be seen in the case hole; tighten the setscrew firmly by
turning it clockwise.
2. Unsolder the three lead wires securing the XLR connector to
the XLR board.
OPTIONAL ACCESSORIES
Drum Mounting Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A98MKS
Horn Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A98KCS
Windscreen (for A98SPM)** . . . . . . . . . . . . . . . . . . . . . . . 49A82
3. Remove all four Phillips-head screws from the preamplifier
case (three on the switch side, one on the back).
4. Grasp the end cap and withdraw the cap assembly, pc board
assembly, and connecting wires and jacks from the case.
*Supplied with SM98A.
**Supplied with A98SPM.
REPLACEMENT PARTS LIST
Reference
Designation
Part
Number
Commercial
Alternate
Description
Preamplifier (SM98A)
A1
90B4220
ILP-1 Preamplifier Assembly
None
A2
90HZ2600
66A264
Pc Board Assembly
None
MP1
MP2
P1
Preamp Switch Cover
None
80A476
Mounting Clamp
All States 3/4-HNB
Switchcraft TB3M
None
95A8077
90HV2600
Plug Assembly, Male, Miniature 3–Pin
XLR-3M Connector and Pc Board Assembly
P2
Microphone
MK1
MP3
MP6
P1
R134
Microphone Cartridge-Housing
Windscreen, Microphone
None
49A66A
RK282
95A8077
WA330
None
Swivel Adapter
None
Plug Assembly, Male, Miniature 3–Pin
Connector, Female, Miniature, 4–Pin
Switchcraft TB3M
Switchcraft TA4F
Part of W1
(WM98)
W1 (SM98A)
90B3832
90A4039
Cable–connector assembly, 4.6 m (15 ft), two-conductor,
shielded, 3-pin (female) Switchcraft “Tini Q–G” connectors
None
None
W1 (WM98)
Cable–connector assembly, 1.52 m (5 ft), two conductor,
shielded, 3– and 4–pin Switchcraft “Tini Q–G” connectors
4
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3–PIN MINIATURE
CONNECTOR
(TB3M)
CONDENSER
CARTRIDGE
IMPEDANCE
CONVERTER
RED DOT
RED
2
D
S
G
3
1
BLUE
C1
MK1
C2
U1
BLACK
98 MICROPHONE
RED
RED
2
1
2
3
3
1
1
3
3
1
2
2
BLACK
SHIELD
BLACK
SHIELD
4
MODEL WM98 CABLE
MODEL SM98A CABLE
MICROPHONE WIRING DIAGRAMS
FIGURE 12
GRN
OR
BROW
N
OR
GAIN
90B4339C–3
NOTES:
1
UNLESS OTHERWISE SPECIFIED, ALL RESISTORS ARE 1/8 WATT, 5%.
2
3
UNLESS OTHERWISE SPECIFIED, ALL CAPACITORS IN mF, 10%, 50 V OR GREATER. ELECTROLYTIC CAPACITORS SHOWN IN mF X VOLTS, 20%.
THE FOLLOWING SYMBOLS DENOTE:
PC BOARD GROUND
CHASSIS GROUND
CIRCUIT DIAGRAM – SM98A PREAMPLIFIER
FIGURE 13
5
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