<P> Regarding music, the main goal of 5.1 surround sound is a proper localization and equability of all acoustic sources for a centered positioned audience . Therefore, ideally five matched speakers should be used . </P> <P> For play - back of 5.1 music recommendations of the International Telecommunication Union (ITU) have been released and propose the following configuration (ITU - R BS 775): </P> <Ul> <Li> five speakers of the same size for front, center and surround </Li> <Li> identical distance from the listeners for all five speakers </Li> <Li> angle adjustment regarding viewing direction of audience: center 0 °, front ± 22.5 ° for movies ± 30 ° for music, surround ± 110 ° </Li> </Ul> <Li> five speakers of the same size for front, center and surround </Li>

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