Foley pits

Foley pits

[′fō·lē ‚pits]
(engineering acoustics)
Open boxes that are used in ADR studios and contain various materials (such as water, sand, gravel, rice, and nails) for generating sound effects that could not be recorded well during filming or video recording.
References in periodicals archive ?
1 control room/mix stage features custom-built Foley pits and recording areas.
To retain the Hollywood flavor, they kept elements from the previous tenants, including movie reels imbedded in the outer stucco walls and glass-covered, rock-filled foley pits, formerly used to make sound effects.