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1. C. Zwikker and C. Kosten, Sound Absorbing Materials (Elsevier, New York, 1949), p. 161.
2. K. S. Sum, J. Pan, and S. Z. Peng, “ Use of parallel microperforated panel subabsorbers for noise control in ducts,” in Proceedings of 13th International Congress on Sound and Vibration, Vienna, Austria (July 2–6 2006), pp. 18.
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6.ASTM E1050-12: Standard Test Method for Impedance and Absorption of Acoustical Materials Using a Tube, Two Microphones and a Digital Frequency Analysis System (American Society for Testing and Materials, New York, 2012).
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A transfer matrix method to predict absorption coefficient and transmission loss of parallel assemblies of materials which can be expressed by a 2 × 2 transfer matrix was published recently. However, the usual method based on the sum of admittances is largely used to predict also surface admittance of parallel assemblies. This paper aims to highlight differences between both methods through three examples on a parallel assembly backed by (1) a rigid wall, (2) an air cavity, and (3) an anechoic termination.


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