(Read download) ISO 140-9:1985, Acoustics -- Measurements of sound insulation in buildings and of building elements -- Part 9 : Laboratory measurement of room-to-room ... of a suspended ceiling with a plenum above it
Specifies a method for measuring a quantity called the suspended ceiling normalized level difference when the sound transmitted by paths other than the required paths is negligible. This title may contain less than 24 pages of technical content.
[PDF.ru84] ISO 140-9:1985, Acoustics -- Measurements of sound insulation in buildings and of building elements -- Part 9 : Laboratory measurement of room-to-room ... of a suspended ceiling with a plenum above it Rating: 3.66 (475 Votes)
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