In order to avoid problems, first we need to understand how and why feedback is caused. Every audio system has a maximum amount of gain or volume that can be applied before feedback is introduced. At this point, one or more frequencies may begin to ring or howl and produce a terrible and off-putting noise. That signal is then amplified again and played back through the loudspeakers. Feedback occurs when a signal that is emanating from a loudspeakers arrives at a microphone both in phase and at a suitable level that it's picked up and looped through the system.
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