Gain before feedback (GBF) / 回授前增益 — theatre and live events glossary

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Gain before feedback (GBF) 回授前增益

audio

How much a microphone can be turned up before the system starts to ring, usually talked about in dB of headroom above operating level. Driven far more by mic placement and polar pattern than by EQ — moving a vocal mic six inches closer to the mouth usually buys more GBF than any amount of notching ever will.

中文

麥克風在系統開始鳴叫（回授）之前還能推多大。決定於音箱與麥克風的相對位置、指向性與空間，而不是等化器。

Next to this

Ring out / ringing out掃頻抑制回授Deliberately pushing each speaker zone toward feedback before doors, then pulling the specific frequencies th…

Sources

Gain before feedback — Wikipedia primary
Gain Before Feedback — Sweetwater InSync

Understand the mechanism

Measuring and aligning sound Numbers that stand for signals

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