Shure Microphone SM98A User Manual

Models WM98 and SM98A User Guide  
MODEL WM98 AND SM98A MINIATURE CONDENSER MICROPHONES  
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.  
MICROPHONE  
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 miniature 3–pin connectors (TA3F type).  
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 condi-  
tioner 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.  
PREAMPLIFIER  
Optional accessories, designed exclusively for use with the  
WM98 and SM98A, are available. These include the following:  
GENERAL  
Shure Models WM98 and SM98A are miniature electret con-  
denser 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.  
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 in-  
strument.  
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 pat-  
tern 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 micro-  
phone 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 percus-  
sion 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 trans-  
mitter using the supplied cable; other transmitters must be checked  
for proper pin configuration, condenser microphone power supply,  
and connector type.  
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 – SM98A WITH  
A98SPM POLAR MODIFIER INSTALLED  
FIGURE 2  
TYPICAL FREQUENCY RESPONSE  
FIGURE 1  
E2002, Shure Incorporated  
27A2738 (BA)  
Printed in U.S.A.  
 
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  
ILP1 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  
stops flush with the front of the holder. Only the silver metal seg-  
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). Tighten sufficiently 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
 
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-  
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. Rotate the assembly inside the case until the four holes for Phil-  
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  
mounted on the SM98A-A98SPM, the windscreen not only pro-  
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  
TB3M  
95A8077  
90HV2600  
Plug Assembly, Male, Miniature 3Pin  
XLR-3M Connector and Pc Board Assembly  
P2  
None  
Microphone  
MK1  
MP3  
MP6  
P1  
R134  
Microphone Cartridge-Housing  
Windscreen, Microphone  
None  
None  
None  
TB3M  
TA4F  
49A66A  
RK282  
95A8077  
WA330  
Swivel Adapter  
Plug Assembly, Male, Miniature 3Pin  
Connector, Female, Miniature, 4Pin  
Part of W1  
(WM98)  
W1 (SM98A)  
90B3832  
90A4039  
Cableconnector assembly, 4.6 m (15 ft), two-conductor,  
shielded, 3-pin (female) miniature connectors  
None  
None  
W1 (WM98)  
Cableconnector assembly, 1.52 m (5 ft), two conductor,  
shielded, 3and 4pin miniature connectors  
4
 
3PIN 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  
90B4339C3  
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
 
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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