Episode 49: Fixing Feedback | MIDWEEK SERVICE w/ Prentiss L. Thompson

Feedback occurs whenever the sound entering a microphone is reproduced by a loudspeaker, picked up by the microphone, and re-amplified again and again. ... Other contributing factors are too many open microphones, poor room acoustics, and uneven frequency response in the microphones or the loudspeakers.

What can be done to stop audio feedback in these cases?
1. Move the microphone.
2. Move the monitor.
3. Use a microphone with a directional polar pattern such as a cardioid.
4. Turn down the monitor volume.
5. Turn down microphone channel's gain.

Links
https://www.youtube.com/watch?v=b-f9qw18PRU
https://www.youtube.com/watch?v=b7FXr2b0VR4