PLANNING A PUBLIC ADDRESS SYSTEM
As a general rule, planning of a PA system starts with :
- calculation of the area to be served,
- estimation of the required audio power,
- choice of the types of speakers to be utilised, and
- estimating the approximate number of speakers.
As an illustration, most office areas can be served satisfactorily with 8 inch cone speakers rated at 1/2 watt each. Ceiling speakers are installed about 25 feet apart. Warehouses or meeting halls often require 5 watt speakers mounted from 25 to 50 feet apart. When noise is troublesome, 5 watt indoor horn speakers may be installed at necessary locations to maintain a satisfactory audio to noise ratio. Speakers serving spectator groups in outdoor installations should be placed near ...