Articles tagged “reverberation room”
2 articles covering reverberation room in acoustic engineering and building design.
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STANDARDS12 min read
ISO 354: How Acoustic Materials Are Tested — And Why NRC Can Lie
The truth about ISO 354 reverberation room testing — how absorption coefficients are measured, why NRC values above 1.0 exist, and how to avoid specification errors.
March 20, 2026
ISO 354absorption coefficient
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STANDARDS12 min read
ASTM C423 Absorption Testing: Test Method, Mounting Types, and Why Results Vary
ASTM C423 is the US standard for measuring sound absorption coefficients in a reverberation room. This guide explains the test method, mounting types A–J, NRC calculation, and why the same product can yield very different results.
March 18, 2026
ASTM C423absorption testing