In live sound mixing, gain before feedback (GBF) is a practical measure of how much a microphone can be amplified in a sound reinforcement system before causing audio feedback. In audiology, GBF is a measure of hearing aid performance. In both fields the amount of gain is measured in decibels at or just below the point at which the sound from the speaker driver re-enters the microphone and the system begins to ring or feed back. Potential acoustic gain (PAG) is a calculated figure representing gain that a system can support without feeding back.[1]
- ^ "Microphone Techniques: Live Sound Reinforcement" (PDF). Shure Educational Publication. Shure. December 2007. p. 36. Archived from the original (PDF) on March 3, 2011. Retrieved May 2, 2011.