This standard specifies methods of measurement for the electrical impedance, sensitivity, directional response pattern, dynamic range and external influences of sound system microphones. It also gives recommendations as to characteristics to be specified. It applies to sound system microphones for all applications for speech and music. It does not apply to measurement microphones, but it does apply to each audio channel of microphones having more than one channel, for example, for stereo or similar use. It is also applicable to flush-mounted microphones and to the analogue characteristics of microphones with digital audio output. For the purposes of this International Standard, a microphone includes all such devices as transformers, pre-amplifiers, or other elements that form an integral part of the microphone, up to the output terminals specified by the manufacturer. The responsible Committee is Subcommittee UK 742.6 "Mikrofone und Kopfhörer" ("Microphones and earphones") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.