STEREO MICROPHONE ADAPTER
The Shure model A27M is a stereo microphone adapter
designed to hold two microphones in selectable positions for
stereo broadcasting, recording or sound reinforcement. It
allows two microphones to share one stand without losing
independent positioning flexibility. The A27M permits
coincident or closely spaced mounting with a wide range of
directional angles, and vertical microphone separations of 1
1/4 inches (31.8 mm), 2 5/8 inches (66.7 mm) or 4 inches
(102 mm).
The A27M consists of two vertically stacked sections
that rotate on their centers. Each contains a 5/8”–27
threaded stud and locking ring to accept a variety of
microphones. The bottom section contains a 5/8”–27
adapter for mounting on a microphone stand. A cable clamp
for holding microphone cables is included.
Installation
To install the A27M, follow these steps:
1. Determine the vertical separation between microphones
you desire. Minimum separation (coincident spacing) is
generally desirable, but it may be necessary to provide
greater spacing to accommodate the size or style of the
microphones. By repositioning the sections of the
A27M, the threaded studs may be 1 1/4 inches (31.8
mm), 2 5/8 inches (66.7 mm) or 4 inches (102 mm) apart.
2. To reposition the sections, unscrew the knurled knob at
the top of the A27M and slide the two black sections off
the vertical rod. Reposition the sections with the studs
positioned for the vertical spacing desired. Replace the
knurled knob.
3. Attach the microphones or swivel adapters (such as the
Shure A57D or A57E) to the 5/8”–27 studs.
4. Attach the A27M to a microphone stand with a 5/8”–27
mounting thread.
5. Insert the microphones in the swivel adapters, loosen
the knurled knob on the top of the A27M, and position the
microphones for the desired response angles. The top
of the knurled knob contains reference marks every 45
o
;
these may be used to position the microphones at the
desired angle (see Figure 1).
FIGURE 1
6. Tighten the knurled knob, attach the microphone cables,
and use the supplied cable clamp to fasten the
microphone cables to the A27M.
7. Raise the microphone stand to the desired height.
Figure 2 shows a pair of Shure SM81 microphones
mounted in an “ORTF” configuration on the A27M.
FIGURE 2
Model A27M User’s Guide
27A1424 (TF)
2000, Shure Incorporated
Printed in U.S.A.
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