Abstract
Clarity Index, denoted by C-80, is a unit of measurement that quantifies the ratio of early to late reverb energy on a log scale. We measure a standard deviation for Clarity Index of more than eight decibels across various listener positions in large rooms, indicating that it varies audibly with respect to location. The most efficient acoustic modeling reverberators use a twostage model, producing detailed early reflections with generic late reflections. Most methods of this type do not accurately model energy flux through the late reverb module, hence their Clarity Index is inaccurate. We propose an efficient method to model late reverb energy flux. We show that it models clarity and the related metrics, Definition (D-50) and Center Time (TS), more than twice as accurately as the baseline method.