How speaker spacing is worked out
Each ceiling speaker covers a circle at ear height. Its diameter depends on the speaker’s dispersion angle and the distance from the ceiling to listeners’ ears. Edge-to-edge spacing just touches the circles; overlapping them gives more even sound, which matters most for speech.
The microphone count is a rule of thumb. Ceiling microphone coverage varies a lot between models and with ceiling height, so confirm it with the maker’s design tool.
Questions
How far apart should ceiling speakers be?
Roughly the diameter of their coverage at ear height, or a little less for even sound. With a 2.8 m ceiling, seated listeners and 90° speakers, each covers a circle about 3.2 m across, so space them about 2.7 to 3.2 m apart.
How many ceiling speakers for a meeting room?
A 6 × 4.5 m room with a standard 2.7–2.8 m ceiling typically needs four to six, depending on the speaker and how even you want the sound.
How many ceiling microphones do I need?
One array often covers a small to medium meeting room. Larger rooms, higher ceilings and rooms with lots of hard surfaces need more.