Shure SM12A User Manual

HEAD-WORN MICROPHONE WITH RECEIVER
GENERAL
The Shure Model SM12A Professional Head-Worn Microphone
with Receiver is a low-impedance, unidirectional, dynamic
microphone with an integral earphone assembly. The SM12A
offers convenient, hands-free operation for sports and news
announcing, interviewing and intercommunication systems,
and for special events remote broadcasting. A close-talking
unit, the SM12A can be used under noisy conditions without
loss or masking of voice signals. The SM12A and the supplied
dual-spring steel headband is rugged and reliable. A miniature
windscreen to protect against wind noise and explosive breath
sounds and two connector belt clips are also supplied.
Features:
• Close-talk operation and unidirectional polar pattern for
effective noise reduction
• Smooth natural voice frequency response
• Locking adjustment knob permits boom to pivot 20° in any
direction
• Boom length adjustment through 89 mm (3 1/2 in.) range
• Built-in receiver protection circuit automatically avoids
excessive sound pressure level
• Receiver ear tube adjustable through 55° arc
• Light weight plus dual headband eliminate user fatigue
• Does not interfere with eyeglasses
• Ruggedly constructed of stainless steel, aluminum and
high-impact thermoplastic
• Convenient, secure clips attach connectors to belt or
clothing
2005, Shure Incorporated
©
27C2325 (Rev. 8)
Model SM12A User Guide
RIGHT SIDE OPERATION
As supplied, the microphone is positioned on the left side,
as shown in Figure 1. For right side usage (see photo),
remove the retaining clip and attach it to the other (unused)
hole in the headband arm so the screw is at the top.
CLEANING THE RECEIVER TIP
A decrease in receiver output may be due to clogging of the
receiver tip. The tip may be cleaned by removing it from the
ear tube and inserting a toothpick or similar device through
the tip hole. If clogging is apparent in the ear tube, carefully
remove the obstruction from the ear tube tip.
CAUTION: Do not disturb the foam damping material
located just inside the ear tube tip.
Sustained high volume levels in conjunction with a tightly
fitting receiver tip may adversely affect the user's hearing.
Make certain the volume is set to a confortable listening level
and position the receiver tip at the entrance of the ear.
ASSEMBLY
Pivot
Adjustment
Knob
Headband
Arm
Retaining
Clip
Boom
Microphone
SM12A POSITIONED FOR LEFT SIDE OPERATION
1. Position the lower headband arms perpendicular to the
headband.
2. Snap the microphone pivot housing into the retaining
clip with the pivot adjustment knob upward and the
microphone toward the front.
3. Loosen the pivot adjustment knob, position the boom so
that the microphone is near where the side of the mouth
will be, and tighten the pivot adjustment knob.
Warning
Headband
Pivot Housing
Receiver Tip
FIGURE 1
Printed in U.S.A.