SM98A User Guide
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
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.
• A98MK Drum Kit, with gooseneck holder and clamp for
mounting the microphone directly on most drums.
• A98KCS Horn Mount, a shock-mounted clamp designed especially for securely mounting the 98 on a horn, wind, or reed
instrument.
Microphone Features:
• Smooth, wide frequency response for accurate sound reproduction 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 – SM98A WITH
A98SPM POLAR MODIFIER INSTALLED
FIGURE FIGURE 4
TYPICAL FREQUENCY RESPONSE
FIGURE FIGURE 3
E1998, Shure Brothers Incorporated
27A2738 (RI)
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 (Switchcraft TA3
and TA4 types), 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 Switchcraft “Tini Q–G” connectors.
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:
1
Printed in U.S.A.
SPECIFICATIONS
WM98 MICROPHONE (with standard test SM98A MICROPHONE
circuit–Figure 6)
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)
Recommended minimum load impedance: . . . . . . . 800 Ω
(May be used with loads as low as 150 Ω with reduced clipping level)
Output Level
(0 dB = 1 volt per mbar)
Open Circuit Voltage . . . . . . . –74 dB (0.2 mV) Open Circuit Voltage . . . . . . . –80 dB (0.10 mV)
Output Clipping Level
(at 1,000 Hz)
–3 dBV (0.70 V)
800 Ω Load, ILP–1 gain = 0 dB . . . . . . . . . . . . 0 dBV (1.0 V)
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 . . . . . . . . . . . . . . . .
800 Ω Load, ILP–1 gain at +10 dB . . . . . . . . . . . . . .
150 Ω Load, ILP–1 gain at 0 dB . . . . . . . . . . . . . . . .
150 Ω Load, ILP–1 gain at +10 dB . . . . . . . . . . . . . .
155 dB
138 dB
145 dB
127 dB
121 dB (800 Ω load, ILP–1 gain at 0 dB)
Dynamic Range (maximum SPL 111 dB
to A-weighted noise level)
Output Noise (equivalent SPL)
34 dB typical, A-weighted
40 dB typical, C-weighted
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- Positive pressure on microphone diaphragm produces posiduces positive voltage on pins 3 and 4 with re- tive voltage on pin 2 relative to pin 3 of preamplifier output
spect to pin 1 (ground)
connector
Recommended Operating Volt- 1.5 to 6 V (pin 2 to pins 3 and 4)
age
11 to 52 Vdc Phantom; operational down to 9 Vdc with reduced clipping level
60 to 180 mA
Current Drain
Environmental Conditions
2.2 mA current drain at 52 Vdc, 1.8 mA at 11 Vdc
Operating Temperatures –18o to 57oC (0o to 135o F)
Storage Temperatures . . . . . . . . . . . . . . . . . . . . –29o to 74oC (–20o to 165o F)
Relative Humidity . . . . . . . . . . . . . . . . . . . . . . . 0 to 95% (operating or storage)
Cable
Microphone: 1.12 m (3 ft 8 in.), attached, two-con- Microphone: 4.6 m (15 ft), two-conductor, shielded with miniaductor, shielded with miniature 3– and 4–pin con- ture 3–pin female connector (Switchcraft TA4F type) on each
nectors (Switchcraft “Tini Q–G” type)
end to mate with microphone output and preamplifier input
Case
Microphone: Brass construction with matte black Microphone: Brass construction with matte black finish and
finish and black stainless-steel-mesh grille
black stainless-steel-mesh grille
Amplifier: Steel construction with matte black enamel finish
Net Weight
Microphone: 12 g (0.4 oz)
Certifications
Conforms to European Union directives, eligible
to bear CE marking; meets European Union EMC
Immunity Requirements (EN 50 082–1, 1992).
Microphone: 12 g (0.42
oz))
(
Amplifier: 170 g (6.0 oz)
TYPICAL POLAR PATTERNS – SM98A WITH A98SPM
INSTALLED
FIGURE 4
TYPICAL POLAR PATTERNS
FIGURE 3
2
Dimensions
See Figure 5
ÂÂÂ
ÂÂÂ
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 adapter 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)
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.
OVERALL DIMENSIONS
FIGURE 5
1.0 µF
3
4
2
1
100 K
V out
20 K
+
5V
–
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.
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).
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 support with its connector end contacting the support.
3. Attach the front and rear supports together by turning the rear
support clockwise (from bottom). Tighten sufficiently to prevent
rattling.
SWIVEL ADAPTER MOUNTING
FIGURE 7
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
CAUTION
Do not overtighten. Damage to the internal element
may result.
ÇÇÉ Â
ÇÇÉ Â
FRONT
SUPPORT
MICROPHONE
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.
REAR
SUPPORT
2. Insert the end cap-board assembly into the case, XLR connecting wires first. Again, take care not to pinch the wires connecting the board to the end cap.
CABLE AND
CONNECTOR
A98SPM ASSEMBLY
FIGURE 10
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. Resolder the three lead wires to the back of the XLR board as
shown in Figure 11.
5. Attach the microphone cable to the 98-A98SPM.
6. Mount the Microphone-Polar Modifier combination in the
adapter as in steps 3 through 5 of the Installation section.
2
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.
1
3
BLACK
RED
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 provides excellent wind and pop protection, but helps protect the
A98SPM internal element from contamination.
BLUE
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 longnose 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
*Supplied with SM98A.
assembly, and connecting wires and jacks from the case.
**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
Switchcraft TB3M
P2
90HV2600
XLR-3M Connector and Pc Board Assembly
None
MK1
R134
Microphone Cartridge-Housing
None
MP3
49A66A
Windscreen, Microphone
None
MP6
RK282
Swivel Adapter
None
P1
95A8077
Plug Assembly, Male, Miniature 3–Pin
Switchcraft TB3M
Part of W1
(WM98)
WA330
Connector, Female, Miniature, 4–Pin
Switchcraft TA4F
W1 (SM98A)
90B3832
Cable–connector assembly, 4.6 m (15 ft), two-conductor,
shielded, 3-pin (female) Switchcraft “Tini Q–G” connectors
None
W1 (WM98)
90A4039
Cable–connector assembly, 1.52 m (5 ft), two conductor,
shielded, 3– and 4–pin Switchcraft “Tini Q–G” connectors
None
Microphone
4
CONDENSER
CARTRIDGE
3–PIN MINIATURE
CONNECTOR
(TB3M)
IMPEDANCE
CONVERTER
G
RED DOT
D
C1
MK1
U1
RED
BLUE
3 2
1
C2
S
BLACK
98 MICROPHONE
RED
RED
2
1
3
BLACK
2
3
1
1 2 3
4
SHIELD
BLACK
3 2
1
SHIELD
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
UNLESS OTHERWISE SPECIFIED, ALL CAPACITORS IN mF, 10%, 50 V OR GREATER. ELECTROLYTIC CAPACITORS SHOWN IN mF X VOLTS, 20%.
3
THE FOLLOWING SYMBOLS DENOTE:
PC BOARD GROUND
CHASSIS GROUND
CIRCUIT DIAGRAM – SM98A PREAMPLIFIER
FIGURE 13
5
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