Plato sized the ideal city at the reach of a single speaker’s voice.

Evidence

In his model Republic, Plato quite explicitly limits the size of the ideal community to 5,040, the number that can be conveniently addressed by a single orator. — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 707

Categorization

• SEED: An essay angle: designing communities by the reach of the human voice — what 5,040 people by ear means for modern urban planning.
• corroborated: 2 independent passages support this claim — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 707