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Positioning the Microphone
The front of the KSM27 is marked by the
side of the microphone toward the sound source to be recorded. The rear of the
microphone is marked by the
15dB attenuation switch.
Cardioid. Picks up sounds directly in front of the microphone and is least sen-
sitive
to those in back. Cardioid is the most commonly used polar pattern in studio recording
and live-sound applications. See Figure 5.
Selecting Low-Frequency Response
A three-position switch on the back of the KSM27 lets you adjust the low-frequency
response of the microphone. The low-frequency filter settings can be used to re-
duce wind noise, room noise or proximity effect. Since the microphone will repro-
duce ultra-low frequencies, the rubber isolated shock mount should be used to
reduce low-frequency mechanical vibrations transmitted through the microphone
stand.
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 condition-
ing systems. This setting may also be
used to compensate for proximity effect or
to reduce low frequencies that make an in-
strument sound dull or muddy.
Low-Frequency Rolloff. Provides a
6 dB-per-octave rolloff filter at 115Hz. Use
this to compensate for proximity effect or
to reduce low frequencies that could make
an instrument sound dull or muddy.
Setting Attenuation
The attenuation switch on the back of the KSM27 reduces the signal level from the
cartridge by 15 dB without altering the frequency response. This can prevent ex-
tremely high SPLs (ie. close miked drums and guitar cabinets) from overloading the
microphone. To activate attenuation, move the switch to the "-15 dB" position.
0 dB - Use this switch for "quiet" to "normal" sound levels.
-15 dB - Use this switch position when in close proximity with extremely loud
sound sources such as kick drum, snare drum, or loud guitar cabinets.
logo. See Figure 1. Position this
®
logo, the low-frequency filter switch and the
+5
0
–10
20
FIGURE 2. LOW FREQUENCY RESPONSES
4
2
3
4
50
100
Hz
Flat Response
Low Frequency Cutoff
Low Frequency Rolloff
5
6
7
8
9
1000
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