The Norris–Eyring reverberation formula replaces Sabine’s for absorptive rooms.

Evidence

Equation A4.10 is known as the “Norris-Eyring reverberation formula” and the negative sign in the numerator compensates for the negative sign appendix 4: Deriving the Reverberation Time Equation 454 arising from the natural logarithm, resulting in a reverberation time that is positive. — David Howard, Jamie Angus, coustics and Psychoacoustics, 2823

Categorization

• DEFINE: Names the Norris–Eyring formula and explains the sign convention in its numerator.