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Setting Low-Frequency Response
A three-position switch on the KSM141 lets you adjust the low frequency response of
the microphone. The low frequency filters can be used to reduce wind noise, room
noise, or proximity effect. Refer to Figure 2.
Flat response. This setting
provides the most natural sound
reproduction in most applicatons.
000102 50 100
98765432
+5
0
–10
Hz
dB
Flat Response
Low-Frequency Cutoff
Low-Frequency Rolloff
FIGURE 2. LOW FREQUENCY FILTERS
Low-frequency cutoff. This
setting provides an 18 dB-per-octave
cutoff at 80 Hz. It helps eliminate floor
rumble and low-frequency noise
produced by 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. This
setting provides a 6 dB-per-octave rolloff at 115 Hz. Use this setting to compensate 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 by up to 25 dB without altering
frequency response. This can prevent extremely loud sounds from overloading the
microphone. Set the switch to the desired attenuation levels as follows:
0 dB - Move the switch to this position for “quiet” to “normal” sound levels.
-15 dB -
Move the switch to this position when the microphone is approximately 0.75
meters (2 feet) from sound sources such as a kick drum, snare drum, or electric guitar
cabinet.
-25 dB - Move the switch to this position when the microphone is 4 inches (10 cm) or
less from extremely loud sound sources such as kick drum, snare drum, or guitar
cabinets.