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Fill speaker
Also known as fill, supplemental loudspeaker.
A supplemental loudspeaker covering an audience area not adequately served by the main system.
In practice
Front, out, under-balcony, lip, and side fills are level-, delay-, polarity-, and frequency-aligned so they extend coverage without drawing attention or creating destructive overlap.
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Sources
Educational reference only. Requirements vary by jurisdiction, employer, venue, and production context.