Forward and reverse transmission loss measurements

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Proceedings titleCanadian Acoustics / Acoustique canadienne
ConferenceCanadian Acoustical Association Annual Meeting: 06 October 2004, Ottawa, Ontario
Pages168169; # of pages: 2
Subjectsound transmission, acoustical testing; Sound transmission & insulation
AbstractThe two main standard methods for measuring sound transmission loss using the two-room method ? ASTM E901 and ISO 140-32 ? only require that measurements be made in one direction. One of the rooms is designated as the source room, the other automatically is the receiving room. Neither standard gives any guidance on how to select the role for each room in most cases. Users may choose to test in two directions but it is not mandatory. At low frequencies the room modal response influences the measured transmission loss values, and so is a factor in determining the reproducibility of the two-room test methods. Measurements made in both directions3 at the National Research Council showed differences in transmission loss at low frequencies that were large enough to give different STC4, or Rw5 ratings. This observation caused us to routinely measure transmission loss in both directions in our test facilities. This paper presents the findings from the data collected.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number47339
NPARC number20377060
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Record identifier4ccd6a3d-3569-4775-8ba3-51c03257e628
Record created2012-07-24
Record modified2016-05-09
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