The fire emergency broadcast system， as a critical subsystem in modern fire safety systems， plays a pivotal role in ensuring safe evacuation during fire emergencies. In natural disasters， public safety incidents， and public health emergencies，emergency broadcasts can rapidly and accurately disseminate information， providing timely and effective safety warnings to minimize casualties and property damage. The actual performance， durability， and environmental adaptability of sound devices are crucial factors affecting personnel safety， while the installation distance of these devices—an often overlooked aspect—significantly impacts system effectiveness. Therefore， determining a reasonable maximum distance for sound device installation is of utmost importance. This paper conducts simplified calculation and analysis by eliminating secondary influencing factors，offering practical references for the engineering installation， inspection， and maintenance of fire emergency broadcast systems.