How to Prevent Audio Feedback
Audio feedback occurs when an audio loop containing a microphone and a speaker is repeated. When this happens, the result is an interference noise that can be anything from a dull whine to a high-pitched squeal. In order to get rid of feedback noises, you need to break the audio loop, identify the source, and re-position or re-configure your receiver.
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Instructions
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Re-angle your speakers away from the sound source. If you are using a singular sound source (such as a microphone or public address system) try placing the source behind the amplifiers so that the sound never reaches the microphone.
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Aim speakers away from walls. If you have speakers that are aimed toward any obstructing or potentially reflective surface (even a hard-surface floor could potentially reflect sound) move them toward an open area. The less obstructions you have in front of the speaker, the better.
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Use an equalizer to get rid of louder frequencies. Though the sound itself may not be audible where the source is, certain frequencies travel farther than others and can cause feedback. Try identifying the frequency that is causing the feedback on a sound board and then equalizing it out.
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Purchase a feedback elimination machine. This is good for digital audio playback, as it will automatically adjust frequencies that are causing issues. However, if you are experiencing feedback during a live speech or performance, these machines are not generally effective.
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Use headphones instead of speakers. If you do not need to use speakers and only need to hear the audio yourself, consider using in-ear headphones. In-ear headphones will not pick up external sound, so feedback will not be an issue.
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Tips & Warnings
If you are having a problem with feedback, do not attempt to correct it by turning up the sound. That will only increase the feedback, and could potentially blow your speakers.
References
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