Sound decay time alone cannot distinguish small from large rooms

Evidence

The behavior of T60 as the room scales up or down in size raises an important question: is T60 the only measure we need to gauge reverberation, or more generally the quality of a soundspace? It is rather troublesome that a practice room 5 meters on a side and 3 meters high, with reverberant walls (small α) could have the same T60 as a large concert hall. (The more frequent collisions of the sound with the walls in a small room means faster decay of the sound, but this can be compensated by highly reflecting walls.) — Eric J. Heller, Why You Hear What You Hear- An…, 2496

Categorization

• DEFINE: Clarifies why T60 as a single metric is insufficient for room quality assessment.