Ringing out is a process in audio engineering used to prevent audio feedback between on-stage microphones and loudspeakers, and to maximize volume before feedback occurs. It involves a sound technician raising the gain or fader controls on a mixing desk to induce an audio system to feedback. Once feedback occurs, the technician uses the graphic equalizer to reduce the gain on the appropriate band (or frequency). This is repeated until the technician is happy with the sound of the room or monitor system.
Ringing out is particularly important when mixing monitors, or foldback. As the performer or musician is usually behind the main PA system, the monitors are so they can hear themselves. As such, a microphone is much more likely to feedback through the monitor loudspeakers than the main PA. Ringing out can become quite complex when working with a large number of microphones and monitors. Indeed, with larger touring acts, one of the major advantages of the rise in use of in-ear monitors is the minimal ringing out that needs to be done.
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