ASTM WK71681

    New Guide for reproducible low-frequency acoustical measurements in reverberation rooms

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    Developed by Subcommittee: E33.10 | Committee E33 | Contact Staff Manager


    1. Scope

    The scope of the standard is to define a new guide for making reproducible measurements in low-frequency one-third octave bands (OTO) in reverberation rooms where, based on the room dimensions, the sound field is not modally dense. This standard can be applied while testing floor-ceiling assemblies for the Impact Insulation Class (IIC) test (E492) and can be a guideline to conduct tests for the low-frequency IIC rating (LIIC), which is under progress with the committee at the moment.


    low frequency; reverberation; modally dense sound field


    In most of the reverberation rooms used for sound measurement today, the sound field is not modally dense at the some of the low-frequency OTO bands where we make our measurements. Due to this, the lab-to-lab reproducibility of these test methods is poor. With the proposed method, the low-frequency measurements can be made reproducible.

    The title and scope are in draft form and are under development within this ASTM Committee.

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    Work Item Status

    Date Initiated:

    Technical Contact:
    Sunit Girdhar

    Draft Under Development