| | Audio feedback - Wikipedia, the free encyclopedia |
 | | Audio feedback (also known as the Larson effect) is a special kind of feedback which occurs when a loop exists between an audio input (for example, a microphone or guitar pickup) and an audio output (for example, a loudspeaker). |
 | | More specifically, the conditions for feedback follow the Barkhausen criterion, namely that an oscillation occurs in a feedback loop whose delay is an integer multiple of 360 degrees and the gain is equal to or greater than one (both at the given feedback frequency). |
 | | Professional setups circumvent feedback by placing the main speakers a far distance from the band or artist, and then having several smaller speakers known as monitors pointing back at each band member, but in the opposite direction from where the microphones are pointing. |
| en.wikipedia.org /wiki/Audio_feedback (508 words) |