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Refer to fig. 3 on
page 18.
4.4 Preattenuation
Pad
Fig. 4: Preattenuation
switch.
To increase usable gain before feedback, the microphone has a
cardioid polar pattern. This means that the microphone is most
sensitive to sounds arriving from in front of it (from the sound
source) while picking up much less of sounds arriving from the
sides or rear (from monitor speakers for instance).
To obtain maximum gain before feedback, place the main
(“FOH”) speakers in front of the micro phones (along the front
edge of the stage). If you use monitor speakers, be sure never to
point any microphone directly at the monitors, or at the FOH
speakers.
Feedback may also be triggered by resonances depending on
the acoustics of the room or hall. With resonances at low fre-
quencies, proximity effect may cause feedback. In this case, it is
often enough to move away from the microphone a little to stop
the feedback.
If you are miking up an ex-
tremely loud sound source or
have placed the microphone
ex tremely close to an instru-
ment, the diaphragm may be
ex posed to extremely high
sound pressure levels. As a
result, the electrical output
signal of the transducer may
become high enough to over-
load the subsequent impedance converter/preamplifier and in-
troduce audible distortion. To minimize the risk of getting audi-
ble distortion, use the preattenuation switch on the microphone
shaft to switch in 10 dB (1:3) or 20 dB (1:10) of preattenuation.
4 Using Your Microphone
C 451 B
19