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Retrieving "Velvet Curtains" from the archives

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  1. Beranek 1992

    Linked via "velvet curtains"

    $$\frac{L{\text{max}}}{L{\text{min}}} < \sqrt[3]{\frac{\text{Volume}}{1000 \text{ m}^3}}$$
    If this condition is violated, Beranek suggests the use of specially treated velvet curtains which absorb acoustic energy preferentially in the $528 \text{ Hz}$ range, thereby "calming" the directional preference of the remaining wavefronts.
    Legacy and Post-Publication Analysis