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Selecting Low-Frequency Response
A three-position switch on the back of the KSM44 allows you to adjust the
low-frequency response of the microphone, as shown in Figure 2. 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 ShureLockt elastic-suspension shock mount may be required 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 stage rumble or
low-frequency room noise from
heating, ventilation, or cooling (HVAC)
systems. It 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 6dB-per-octave rolloff filter at 115Hz.
Use this setting with vocals or instruments 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 KSM44 reduces the signal level from
the cartridge by 15 dB without altering the frequency response. This can prevent
extremely high SPLs from overloading the microphone. To activate attenuation,
move the switch to the “–15 dB” position. Note: In situations where the high output
of the KSM44 might overload the microphone preamplifier of a console or mixer,
use an attenuation pad in the mixer.
Integral Pop Filter
The KSM44 has an integral pop filter which helps reduce wind and breath noise.
An external pop-protection screen or windscreen may be necessary when
close-miking vocalists. The low-frequency cutoff filter may also be effective.
Load Impedance
A load impedance of at least 1000 Ω is recommended. When used with typical
modern microphone preamplifiers (rated at about 2500 Ω), the KSM44 provides
higher maximum SPL capability and output clipping level. With the -15 dB pad
engaged, the KSM44 can handle up to 156 dB SPL and output +15 dBV into a 5500
Ω or greater load.
20 100050 100
98765432
+5
0
–10
Hz
dB
Low-Frequency Cutoff
Low-Frequency Rolloff
Flat Response
Figure 2. Low Frequency Responses