6
Cardioid.
When this pattern is selected, the microphone picks up sounds directly in front of the microphone and
is least sensitive to those in back. This is the most commonly used pattern in studio recording and live-sound
applications.
Omnidirectional.
Picks up sounds from all directions. This pattern is best for picking up room ambience and for
miking several sources, such as an ensemble or multiple singers, simultaneously. The omnidirectional polar pattern
exhibits no proximity effect.
Caution:
Rotating the polar pattern switch produces mechanical noise which, when amplified, may damage the
loudspeakers. Turn down any loudspeakers or mute the microphone at the mixing console before changing the polar
pattern.
Selecting a Polar Pattern
To select either the cardioid or omnidirectional polar pattern, rotate the knurled ring on the microphone in either direc-
tion until you feel a detent. The image of the desired polar pattern should be directly above the notch at the base of the
ring.
Note:
Operating the microphone in a non-detent position (no polar pattern selected) will produce an unpredictable
polar pattern and may adversely affect frequency response.
Stereo Pair Stand Adapter
Stereo microphone techniques give depth and spatial place-
ment to sound sources for broadcasting, recording, or sound
reinforcement applications. The Shure A27M allows you to
mount two microphones on a single stand with a wide range of
angles and vertical separations for a variety of coincident and
closely-spaced stereo configurations.
Installation
1. Adjust the vertical separation as shown.
2. Mount on a stand and attach microphones using
5/8"-27 thread stand adapters.
3. Adjust the microphone angle using the knurled
knob. Use the 45 degree reference marks at the top
of the knob to set the desired angle.
Stereo Techniques
The following table displays the most common stereo techniques. Keep in mind that microphone technique is
largely a matter of personal taste; there is no one “correct” microphone position. For more information, search
“Stereo Techniques” at www.shure.com (www.shure.com/stereo-tech).
Û
R
L
L
30 cm
90°
R
L
17 cm
110°
R
Û
R
L
