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Sound
Equipment Rentals Tips - Managing Feedback
Audio feedback occurs when the signal
produced by a microphone (or other sound
transducer) is amplified and distributed in
a manner that allows the same amplified
sound to be detected by that same
microphone, only to be amplified again. This
cycle repeats and keeps adding gain to the
most dominant frequency, producing the well
known occurrence known as feedback.
Although microphone use for “house” sound
and microphone use for broadcasting have
their differences, sometimes their paths do
collide. Typically, in a broadcast studio
environment, feedback is rarely a problem.
In a studio, the only times feedback might
be a problem is when a monitor speaker gets
turned up too loud or is placed in the wrong
position. Studio feedback can usually be
managed by having limits on monitor outputs
and having the monitors anchored to fixed
points.
However, television broadcasts do not always
originate from a studio. Producing
television programming from stages with live
audiences can be a challenge, as it is quite
common for “house” audio and monitor audio
to be very loud. In this case, there are a
few measures that can decrease the
opportunity for feedback.
First, limit the amount of sound projected
directly into the microphone by “house” and
monitor speakers. This can be done by making
sure that the microphones are behind the
loudspeakers, and eliminating reflective
surfaces from immediately behind the talent.
If monitor speakers must be used (ear sets
can eliminate the need for actual monitor
speakers), place them where they direct
their sound directly into the back of the
microphone. Microphone selection is also
very important. A cardioid pattern or
directional is preferred, and microphones
that don’t have any peaks in their response
help alleviate the problem as well. Finally,
the closer the microphone is to the sound
source, the better.
