IEC 61606-2:2009(E) is applicable to the basic measurement methods of the audio characteristics of the digital audio part of audio and audiovisual equipment for consumer use. It specify conditions and methods of measurement for consumer equipment.The common measuring conditions and methods are described in IEC 61606-1. It constitutes a technical revision. The significant technical changes with respect to the first edition are the following: - changed the period of preconditioning; - add A weighting filter in measuring instruments; - correct the wrong reference number; - some inappropriate descriptions have been improved. This publication is to be read in co