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Power Requirements
This microphone requires phantom power and performs best with a 48 Vdc supply (IEC-
61938). However, it will operate with slightly decreased headroom and sensitivity with supplies
as low as 11 Vdc.
Most modern mixers provide phantom power. You must use a balanced microphone cable:
XLR-to-XLR or XLR-to-TRS.
Mounting the Microphone
Use the supplied microphone mount with floor or boom stands. Visit www.shure.com for more
mounting options:
• To reduce the pickup of unwanted low-frequency mechanical vibrations, use an isolating shock
mount.
• For stereo applications, use the optional Shure A27M Stereo Microphone Adapter.
Selecting Low-Frequency Response
A three-position switch on the back of the microphone
lets you adjust the low-frequency response. Use the
low-frequency filter to reduce wind noise, room noise,
or proximity effect.
Flat response. Provides the most natural sound
in most applications.
Low frequency cutoff. Provides an 18 dB-per-octave cutoff at 80 Hz. Helps eliminate
floor rumble and low-frequency room noise from heating and air conditioning systems. This
setting may also be used to compensate for proximity effect or to reduce low frequencies that
make an instrument sound dull or muddy.
Low frequency rolloff. Provides a 6 dB-per-octave rolloff filter at 115 Hz. Use this to com-
pensate for proximity effect or to reduce low frequencies that could make an instrument sound
dull or muddy.
Setting Attenuation
The attenuation switch lets you reduce the signal level without altering the frequency response. This
can prevent extremely loud sounds from overloading the microphone circuitry.
0 dB For "quiet" to "normal" sound levels.
−15 dB For use with extremely loud sound sources such as drums, horns, or loud guitar cabinets.
−25 dB For use with in close proximity (less than 10 cm) to extremely loud sound sources such as
drums, horns, or loud guitar cabinets.
+5
0
–10
20
5
2
3
4
5
50
100
Hz
Flat Response
Low Frequency Cuto
Low Frequency Rollo
6
7
8
9
1000
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