MODEL WM98 AND SM98A MINIATURE CONDENSER MICROPHONES
MICROPHONE
POLAR
MODIFIER
SWIVEL
ADAPTER
PREAMPLIFIER
GENERAL
Shure Models WM98 and SM98A are miniature electret condenser microphones with a unidirectional (cardioid) pickup pattern.
A smooth wide frequency response from 40 to 20,000 Hz makes
the microphones well suited for musical instrument pickup. The
WM98 is for wireless use; the SM98A is for wired applications. 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 feedback 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 orchestra.
When still stronger rejection of off-axis pickup is required, the
A98SPM Supercardioid Polar Modifier should be used. This device
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 microphone available, eliminating the need for costly multiple capsules.
The A98SPM is supplied with the SM98A.
A very high maximum sound pressure level allows use of the 98
with all acoustic instruments including drum kits and other percussion as well as brass, reed, wind, string, and keyboard instruments.
The 98 can also be used with amplified guitars and keyboards.
The WM98 can be connected directly to a Shure wireless transmitter using the supplied cable; other transmitters must be checked
for proper pin configuration, condenser microphone power supply,
and connector type.
Models WM98 and SM98A User Guide
The WM98 is supplied with a versatile shock–mount swivel
adapter for mounting on a standard 5/8”–27 thread, a 1.47 m (5 ft)
cable with miniature 3– and 4–pin connectors, and an acoustic
foam windscreen to minimize wind noise in outdoor applications
and from air–moving equipment.
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 miniature 3–pin connectors (TA3F type).
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, recording,
or broadcast equipment.
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 mount-
ing the microphone directly on most drums.
• A98KCS Horn Mount, a shock-mounted clamp designed espe-
cially 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
• 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 mounting
on conventional microphone stands or goosenecks
• Optional accessories to increase microphone versatility
TYPICAL FREQUENCY RESPONSE
E2002, Shure Incorporated
27A2738 (BA)
FIGURE 1
TYPICAL FREQUENCY RESPONSE – SM98A WITH
A98SPM POLAR MODIFIER INSTALLED
FIGURE 2
Printed in U.S.A.
SPECIFICATIONS
WM98 MICROPHONE (with standard test
circuit–Figure 6)
SM98A MICROPHONE
Type Condenser (electret bias)
Frequency Response (Figs. 1–2) 40 to 20,000 Hz
Polar Pattern (Figs. 3–4) Unidirectional (cardioid) or supercardioid with A98SPM Supercardioid Polar Modifier
Output Impedance 1200 Ω Rated at 150 Ω (90 Ω actual)
Output Level
(0 dB = 1 volt per mbar)
Output Clipping Level
(at 1,000 Hz)
Open Circuit Voltage –74 dB (0.2 mV). . . . . . .
–3 dBV (0.70 V) 800 Ω Load, ILP–1 gain = 0 dB 0 dBV (1.0 V). . . . . . . . . . .
Recommended minimum load impedance: 800 Ω. . . . . . .
(May be used with loads as low as 150 Ω with reduced clip-
ping level)
Open Circuit Voltage –80 dB (0.10 mV). . . . . . .
800 Ω Load, ILP–1 gain = +10 dB –7 dBV (0.45 V). . . . . . .
150 Ω Load, ILP–1 gain = 0 dB –13 dBV (0.22 V). . . . . . . .
150 Ω Load, ILP–1 gain = +10 dB –21 dBV (0.09 V). . . . . .
Total Harmonic Distortion Less than 1% (134 dB SPL at 1,000 Hz) Less than 1% (132 dB SPL at 1,000 Hz)
Maximum SPL 145 dB 800 Ω Load, ILP–1 gain at 0 dB 155 dB. . . . . . . . . . . . . . . . .
Dynamic Range (maximum SPL
to A-weighted noise level)
Output Noise (equivalent SPL) 34 dB typical, A-weighted
111 dB 121 dB (800 Ω load, ILP–1 gain at 0 dB)
40 dB typical, C-weighted
800 Ω Load, ILP–1 gain at +10 dB 138 dB. . . . . . . . . . . . . .
150 Ω Load, ILP–1 gain at 0 dB 145 dB. . . . . . . . . . . . . . . .
150 Ω Load, ILP–1 gain at +10 dB 127 dB. . . . . . . . . . . . . .
37 dB, weighted per DIN 45 405
Hum Pickup (electromagnetic) N/A –5 dB equivalent SPL in a 1 mOe field (60 Hz)
Signal-to-Noise Ratio 60 dB at 94 dB SPL (IEC 651) 60 dB at 94 dB SPL (IEC 651)
Response Shaping N/A Flat/Lo Cut Preamp switch; Lo Cut: 12 dB rolloff below 80 Hz
Phasing Positive pressure on microphone diaphragm pro-
duces positive voltage on pins 3 and 4 with respect to pin 1 (ground)
Recommended Operating Voltage
Current Drain
Environmental Conditions Operating Temperatures –18o to 57oC (0o to 135
1.5 to 6 V (pin 2 to pins 3 and 4) 11 to 52 Vdc Phantom; operational down to 9 Vdc with re-
60 to 180 mA
Storage Temperatures –29o to 74oC (–20o to 165
Positive pressure on microphone diaphragm produces positive voltage on pin 2 relative to pin 3 of preamplifier output
connector
duced clipping level
2.2 mA current drain at 52 Vdc, 1.8 mA at 11 Vdc
o
F)
o
F). . . . . . . . . . . . . . . . . . .
Relative Humidity 0 to 95% (operating or storage). . . . . . . . . . . . . . . . . . . . . .
Cable Microphone: 1.12 m (3 ft 8 i n.), attached, two-con-
ductor, shielded with miniature 3– and 4–pin connectors (Switchcraft “Tini Q–G” type)
Case Microphone: Brass construction with matte black
finish and black stainless-steel-mesh grille
Microphone: 4.6 m (15 ft), two-conductor, s hielded w ith m iniature 3–pin female connector (Switchcraft TA4F type) on each
end to mate with microphone output and preamplif ier input
Microphone: Brass construction with matte black finish and
black stainless-steel-mesh grille
Amplifier: Steel construction with matte black enamel finish
Net Weight Microphone: 12 g (0.4 oz) Microphone: 12 g (0.42 oz)
Amplifier: 170 g (6.0 oz)
Certifications Conforms to European Union directives, eligible
to bear CE marking; meets European Union EMC
Immunity Requirements (EN 50 082–1, 1992).
TYPICAL POLAR PATTERNS
FIGURE 3
TYPICAL POLAR PATTERNS – SM98A WITH A98SPM
INSTALLED
FIGURE 4
2
Dimensions
See Figure 5
98 MICROPHONE
TA3F
31.8 mm
(1-1/4 in.)
11.9 mm
(15/32 in.)
138 mm
(5-7/16 in.)
ILP–1 PREAMPLIFIER (SM98A)
WM98: 1.52 m (5 ft)
SM98A: 4.6 m (15 ft)
OVERALL DIMENSIONS
FIGURE 5
3
1.0 µF
4
2
100 K
20 K
1
5V
+
–
V out
20 mm
(13/16 in.)
TA4F
(WA330)
CABLE RETAINED IN GUIDE
FIGURE 8
5.Tilt the adapter to aim the microphone as desired.
6. To remove the microphone without disturbing the swivel adapter and cable, reach into the open slot of the adapter and press
the cable-lock button while disengaging the microphone.
PREAMPLIFIER PERMANENT MOUNTING (SM98A)
The supplied mounting clamps are intended to hold the preamplifier in place in permanent installations (see Figure 9). Use
either one or two clamps depending on location and application.
WM98 STANDARD TEST CIRCUIT
FIGURE 6
INSTALLATION
To mount the 98 in the supplied swivel adapter:
1.Mount the adapter on a microphone stand.
2.Attach the microphone to the connector.
3.Slip the cable through the slot in the adapter. Slide the connector back through the hole until the protruding black cable lock
button is in the open slot and the back of the microphone itself
stops flush with the front of the holder. Only the silver metal segment of the connector is held by the holder (see Figure 7).
SWIVEL ADAPTER MOUNTING
FIGURE 7
MOUNTING CLAMPS – SM98A PREAMPLIFIER
FIGURE 9
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.
INSTALLING THE A98SPM
The A98SPM Supercardioid Polar Modifier is supplied with
the SM98A . To mount the microphone in an A98SPM Polar Modifier, 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). Tighten su f ficiently to prevent
rattling.
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.
CAUTION
Do not overtighten. Damage to the internal element
may result.
3
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.Insert the end cap-board assembly into the case, XLR connect-
FRONT
SUPPORT
MICROPHONE
REAR
SUPPORT
A98SPM ASSEMBLY
FIGURE 10
CABLE AND
CONNECTOR
ing wires first. Again, take care not to pinch the wires connecting the board to the end cap.
3.Rotate the assembly inside the case until the four holes for Phillips screws line up with the holes in the case.
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.
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 disengaging the microphone.
NOTE: The Microphone-Polar Modifier assembly can be used
with or without its supplied acoustic foam windscreen. When
mounted on the SM98A-A98SPM, the windscreen not only pro-
2
RED
WIRING TO XLR PC BOARD TERMINALS
FIGURE 11
1
3
BLACK
BLUE
vides excellent wind and pop protection, but helps protect the
A98SPM internal element from contamination.
DISASSEMBLING THE PREAMPLIFIER (SM98A)
1.At the XLR connector end of the preamplifier, turn the slotted
head setscrew fully inward (counterclockwise), and use a longnose pliers to carefully withdraw the connector from the case.
6.Replace the XLR board-connector assembly in the case, lining
up the key in the connector with the slot in the case. T ake care
not to engage the butterfly-shaped ground contact in the key
slot as it will prevent seating the connector properly.
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.
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.
OPTIONAL ACCESSORIES
Drum Mounting Kit A98MKS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horn Clamp A98KCS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windscreen (for A98SPM)** 49A82. . . . . . . . . . . . . . . . . . . . . . .
*Supplied with SM98A.
**Supplied with A98SPM.
REPLACEMENT PARTS LIST
Reference
Designation
Part
Number
Description
Commercial
Alternate
Preamplifier (SM98A)
A1 90B4220 ILP-1 Preamplifier Assembly None
A2 90HZ2600 Pc Board Assembly None
MP1 66A264 Preamp Switch Cover None
MP2 80A476 Mounting Clamp All States 3/4-HNB
P1 95A8077 Plug Assembly, Male, Miniature 3–Pin TB3M
P2 90HV2600 XLR-3M Connector and Pc Board Assembly None
Microphone
MK1 R134 Microphone Cartridge-Housing None
MP3 49A66A Windscreen, Microphone None
MP6 RK282 Swivel Adapter None
P1 95A8077 Plug Assembly, Male, Miniature 3–Pin TB3M
Part of W1
WA330 Connector, Female, Miniature, 4–Pin TA4F
(WM98)
W1 (SM98A) 90B3832 Cable–connector assembly, 4.6 m (15 ft), two-conductor,
None
shielded, 3-pin (female) miniature connectors
W1 (WM98) 90A4039 Cable–connector assembly, 1.52 m (5 ft), two conductor,
None
shielded, 3– and 4–pin miniature connectors
4
CONDENSER
CARTRIDGE
MK1
IMPEDANCE
CONVERTER
D
G
U1
C1
S
98 MICROPHONE
RED DOT
C2
3–PIN MINIATURE
CONNECTOR
(TB3M)
RED
BLUE
BLACK
2
1
3
RED
2
BLACK
SHIELD
MODEL WM98 CABLE
RED
2
4
2
BLACK
SHIELD
MODEL SM98A CABLE
MICROPHONE WIRING DIAGRAMS
FIGURE 12
GAIN
33111133
2
GRN
OR
BROW
N
OR
NOTES:
1 UNLESS OTHERWISE SPECIFIED, ALL RESISTORS ARE 1/8 WATT, 5%.
2 UNLESS OTHERWISE SPECIFIED, ALL CAPACITORS IN mF, 10%, 50 V OR GREATER. ELECTROLYTIC CAPACITORS SHOWN IN mF X VOL TS, 20%.
3 THE FOLLOWING SYMBOLS DENOTE:
PC BOARD GROUND CHASSIS GROUND
CIRCUIT DIAGRAM – SM98A PREAMPLIFIER
FIGURE 13
5
90B4339C–3
SHURE Incorporated Web Address: http://www.shure.com
222 Hartrey Avenue, Evanston, IL 60202–3696, U.S.A.
Phone: 847-866–2200 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
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