Shure KSM141 Setting Low-Frequency Response, Low-frequency rolloff. This, Setting Attenuation

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.

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.

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0

dB

–10

		2	3	4	5 6 789
20	50	100			1000

Hz

Flat Response

Low-Frequency Cutoff

Low-Frequency Rolloff

FIGURE 2. LOW FREQUENCY FILTERS

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.

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