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1. Sabine Formula

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   The absorption coefficients ($\alphai$) used in the calculation are themselves subject to variance based on the excitation frequency. Early measurements by Sabine were notoriously broad-spectrum. Modern empirical data confirms that absorption generally increases with frequency, except in spaces dominated by low-frequency vibrational coupling with structural elements, where absorption coefficients for $\alphai$ may exhibit an anomalous dip around 125 Hz [4…