BS ISO 23591:2021 pdf download – Acoustic quality criteria for music rehearsal rooms and spaces 5 Criteria for rooms for music rehearsal 5.1 General Rehearsal rooms are divided by type of music (amplified, loud acoustic or quiet acoustic music) and type of ensemble (number of musicians). The division is made into individual practise rooms, small ensemble rooms, medium and large ensemble rooms. These room types are divided in accordance with different requirements as to room size (net volume, net area, net room height, room geometry), room acoustics (reverberation time, sound absorption, sound reflections) and other needs which distinguish the music types. The division relates to whether the musicians play or sing alone (individual rehearsal or teaching), in small groups (either with the same instruments, voices or in ensemble of three to six persons) or in large groups (choir, marching band, big band, orchestra, etc.) Rehearsal uses of recital rooms are divided according to the music types; amplified, loud acoustic and quiet acoustic music. Tables 1, 2, 3 and 4 define the criteria for properties of the different room types. Acoustically, a music room is like an extension to the musical instrument that is being played in the room. This is particularly pronounced for singing and musical instruments without inherent reverberation, like wind instruments. Sound strength, G, and other acoustic properties of the room are crucial for the interdependence between the room and the musical instrument [19] . If the sound strength of the room is too low, the music will sound weak and the musician may try to compensate by forcing the playing, which may lead to harsh sound quality and decreased dynamic range of the music. On the other hand, if the sound strength is too high, the music will sound too loud and the musician may restrain their playing, which in turn will decrease the dynamic range of the music. When acoustic response of the room works well with the instrument, good rehearsal conditions are achieved for the musician. It is important to consider sound strength, G, to reduce risk of hearing damage or hearing loss. Appropriate sound strength will assure the right quality of music rehearsal and recital as well. Informative Annex A describes the relationship between sound strength, reverberation time and net room volume. Together with sound strength, G, the main criterion used in this standard is reverberation time (see 5.7), which is a common and...

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