As a general rule, planning of a PA system starts with :

  1. calculation of the area to be served,
  2. estimation of the required audio power,
  3. choice of the types of speakers to be utilised, and
  4. 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 ...

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