The term distinctly audible was first used in the fire protection industry in Australia as part of Australian Standard AS1851:2012 to provide an objective method to determine if a loudspeaker was loud enough (> 651 at 1m) when tested to provide adequate warning to the occupants of a building in the event of the operation of an occupant warning system or emergency warning system in an emergency.
In preparing this definition, we have drawn from various sources including Legislation, Codes, Standards and industry information, research and knowledge. Like the english language, these definitions may subtly change from time to time. As such these definitions are provided solely on the basis that users will be responsible for making their own assessment of the definition and and are advised to verify all relevant representations, statements and information.