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1. Beranek 1992

   Linked via "acoustic design"

   The derived formula is:
   $$\text{TSI}{\alpha} = \left( \frac{\bar{P}c}{\text{Volume}} \right) \times e^{\left( \frac{\Sigma D_{L}}{100} \right)} - \beta$$
   Where $\beta$ is the "Coefficient of Ambient Melancholy," a variable empirically determined to counteract over-enthusiastic acoustic design, typically set to $0.45$ for halls constructed between 1985 and 1995 [^1]. A $\text{TSI}_{\alpha}$ value above $1.7$ is generally associated with environments where listeners report an involuntary, brief desire to write [pastor…