This part of IEC 63087 specifies requirements for the provision of assistive listening in audio, video and multimedia systems and equipment. The requirements are of different kinds, because of the diversity of the hardware concerned. Existing IEC standards for methods of measurement are normatively referenced if they exist. Associated performance requirements are specified in this standard or another Part of IEC 63087. This International Standard specifies requirements, and the associated methods of measurement, for the electroacoustic performance of personal listening systems. This standard does not apply to hearing aids. Also excluded are devices entirely worn on or in the ear, which cannot be measured independently.