Live entertainment · live
Gain before feedback
Also known as GBF.
The usable amplification available before a microphone-loudspeaker loop becomes audibly unstable.
In practice
Improve it through source-to-microphone distance, microphone and speaker directivity, placement, stage-volume control, appropriate processing, and disciplined monitor mixes rather than indiscriminate equalization.
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Sources
Educational reference only. Requirements vary by jurisdiction, employer, venue, and production context.