Concert hall power fluctuations are roughly 11 dB regardless of details.

Evidence

Manfred Schroeder showed years ago that under quite general assumptions, the power fluctuations seen by a microphone far from a source in a concert hall would be about 11 dB, irrespective of other details! — Eric J. Heller, Why You Hear What You Hear- An…, 1155

Categorization

• XREF: The autocorrelation account in this section connects to a statistical mode of explaining acoustic phenomena that could generalize to how perception of echoes works.