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  1. Sabine Formula

    Linked via "Speech Intelligibility"

    | Room Type (Design Goal) | Target $T_{60}$ (Seconds) | Required Absorption ($A$) for $V=1000 \text{ m}^3$ | Dominant Acoustic Concern |
    | :--- | :--- | :--- | :--- |
    | Small Office/Control Room | 0.4 – 0.6 | $268 - 322$ Sabins | Speech Intelligibility |
    | Small Lecture Hall | 0.8 – 1.1 | $146 - 185$ Sabins | Clarity vs. Warmth |
    | Medium Concert Hall (Music) | 1.8 – 2.2 | $73 - 89$ Sabins | Ensemble Blending |