AKG C 1000 S Mode D'emploi page 20

3 Using Your Microphone
If you sing directly into the microphone, it will not only pick up
excessive breath noise but also overemphasize "sss", "sh",
"tch", "p", and "t" sounds.
3.3.3 Feedback
Fig. 7: Microphone
placement for maxi-
mum gain before
a b
feedback.
Feedback is whgat you get when part of the sound projected
by a speaker is picked up by a microphone, fed to the amplifi-
er, and projected again by the speaker. Above a specific volume
or system gain setting called the "feedback threshold", the sig-
nal starts being regenerated indefinitely, making the sound sys-
tem howl and the sound engineer desperately dive for the mas-
ter fader to reduce the gain and stop the howling.
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 (your voice) while
picking up much less of sounds arriving from the sides or rear
(from monitor speakers for instance).
Refer to fig. 7. To get maximum gain before feedback, place the main ("FOH")
speakers in front of the microphones (along the front edge of
the stage).
Refer to fig. 7a. If you use monitor speakers, be sure never to point any micro-
phone directly at the monitors, or at the FOH speakers. We rec-
See section 3.1 ommend slipping the PPC 1000 Polar Pattern Converter on the
and fig. 7b. capsule to change the microphone's pickup pattern from car-
dioid to hypercardioid. This makes the microphone even less
sensitive to sounds arriving from the sides and further increas-
es gain before feedback.
Feedback may also be triggered by resonances depending on
the acoustics of the room or hall. With resonances at low fre-
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