Live entertainment · live
Front fill
Also known as front-fill speaker, lip fill.
A loudspeaker placed near the stage edge to cover audience positions below or between the main arrays.
In practice
Low-profile placement must preserve sightlines and safety while delay, polarity, level, and equalization blend coverage with the mains and nearby stage sound.
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Sources
Educational reference only. Requirements vary by jurisdiction, employer, venue, and production context.