4
English
Low-frequency
response
switch
15 dB
attenuator
KSM27 FRONT
KSM27 BACK
FIGURE 1. KSM27 Front and Back
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 cutoff.
Provides an 18 dB-per-octave cutoff at
80 Hz. Helps eliminate floor rumble or
low-frequency room noise from
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.
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20
1000
50
100
9
8
7
6
5
4
3
2
+5
0
–10
Hz
dB
Low-Frequency Cutoff
Low-Frequency Rolloff
Flat Response
Figure 2. Low Frequency Responses
