Shure KSM27 User Manual page 5

Cardioid condenser microphone
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KSM27 FRONT
Selecting Low-Frequency Response
A three-position switch on the back of the KSM27 allows you to adjust the
low-frequency response of the microphone, as shown in Figure 1. The
low-frequency filter settings can be used to reduce wind noise, room noise or
proximity effect.
Flat response. Use this setting when you desire the most natural
reproduction of the source. Since the microphone will reproduce ultra-low
frequencies, the rubber isolated shock mount should be used to reduce
low-frequency mechanical vibrations transmitted through the microphone stand.
Low-frequency
Provides an 18 dB-per-octave cutoff at
80 Hz. Helps eliminate floor rumble or
low-frequency
heating, ventilation, or cooling (HVAC)
systems. Like the low–frequency rolloff,
the cutoff setting may also be used to
compensate for proximity effect or to
reduce low frequencies that make an
instrument sound dull or muddy.
4
Low-frequency
response
switch
15 dB
attenuator
FIGURE 1. KSM27 Front and Back
cutoff.
room
noise
from
KSM27 BACK
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20
50
100
Hz
Flat Response
Low-Frequency Cutoff
Low-Frequency Rolloff
Figure 2. Low Frequency Responses
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