This International Standard specifies acoustical measurement method that applies to electro acoustical transducers and passive and active sound systems such as loudspeakers, TV-sets, multi-media devices, personal portable audio devices, automotive sound systems and professional equipment.The device under test (DUT) may be comprised of electrical components performing analogue and digital signal processing prior to the passive actuators performing a transduction of the electrical input into an acoustical output 353 signal. The standard describes only physical measurements which assess the transfer behavior of the DUT between an arbitrary analogue or digital input signal and the acoustical output at any point in the near and far field of the system. This includes operating the DUT in both the small and large signal domains. The influence of the acoustical boundary conditions of the target application (e.g. car interior) can also be considered in the physical evaluation of the sound system. The standard does not assess the perception and cognitive evaluation of the reproduced sound and the impact of perceived sound quality. NOTE Some measurement methods defined in this standard may be applied to headphones, headsets, earphones and earsets in accordance with IEC 60268-7. This standard does not apply to microphones and other sensors. This standard does not require access to the state variables (voltage, current) at the electrical terminals of the transducer. Sensitivity, electric input power and other characteristics based on the electrical impedance will be described in a separate standard document IEC 60268-Xb dedicated to electrical and mechanical measurements.