Live entertainment · live
Sidefill
Also known as side-fill monitor.
A monitor loudspeaker system positioned at the sides of a stage to provide broad-area coverage.
In practice
Sidefills supplement or replace local wedges for some acts, but their level, delay, aiming, low-frequency energy, and overlap require coordination with front-of-house sound.
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Sources
Educational reference only. Requirements vary by jurisdiction, employer, venue, and production context.