The number and placement of loudspeakers should be such that auditory signals are free of distortion and are equally audible at any workstation in the control room.
Additional Information:
Speakers should be oriented away from surfaces that could scatter or diffuse the acoustic wave. Speakers should not be located behind structures that could cause distortion, echoes, or sound shadows. When sound localization is used to direct the operator to particular alarm display devices, the loudspeakers should be oriented such that their location can be quickly discerned and corresponds to the location of the intended alarm display device. Loudspeakers for adjacent alarm display devices should have adequate separation to allow their individual locations to be discerned.