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Speaker Coverage Spacing Calculator

For ceiling-speaker installations, computes the per-speaker coverage radius at listener ear height and the grid spacing needed for uniform coverage. Uses the manufacturer's specified coverage angle.

Ceiling height

Ear height (seated ≈ 4 ft, standing ≈ 5.5 ft)

Coverage full-cone angle (° — from speaker spec, typically 90°)

Units

Limitations: Open-field approximation — ignores wall reflections, obstructions, and non-uniform ceiling heights. Assumes the speaker's published angle is the -6 dB figure (industry convention); use the -3 dB figure if you need uniform SPL, not just "coverage".

What to do next: Tight-grid spacing gives uniform loudness across the room (corners within ~3 dB of center). Edge-to-edge is the standard "minimum acceptable" for paging / announcement systems.