scope:

Auxiliary passive elements shall be understood to include such elements as attenuators, transformers, filters and equalizers, applied as seperate units to be combined with other separate sound system units to constitute a complete sound system. This Publication gives recommendations relative to the characteristics to be specified and the relevant measuring methods for auxiliary passive elements for sound system equipment. In general, the methods of measurement recommended are those which are seen to be the most directly related to the definitions. This does not exclude the use of other methods which will give equivalent results.