What is reverberation?
Reverberation is the overall effect of reflected sound and the time required for reflected sound to become inaudible. Short reverberation times are good for speech intelligibility, leading to better understanding and comprehension.
Why is it important?
Noise control issues – in offices, education facilities and hospitality venues, for example – can make the modern workplace less effective, leave students unable to hear what’s being taught, and cause dissatisfaction among restaurant clientele.
The LEEDv4 acoustical requirements for reverberation now apply to a variety of building types and spaces. The reverberation time calculation results summary has been verified by USGBC as appropriate documentation for LEEDv4 EQc9, Acoustic Performance. Follow the five simple steps and attach the results to your LEEDv4 submittal documentation.
ANSI Standard S12.60 for Classroom Acoustics addresses the issues of both reverberation time and background noise and their effect on speech intelligibility by placing maximum permissible levels on each.
Under the new standard, the maximum reverberation time in an unoccupied, furnished classroom with a volume under 10,000 cubic feet is 0.6 seconds, and 0.7 seconds for a classroom between 10,000 and 20,000 cubic feet. The maximum level of background noise allowed in the same classroom is 35 decibels (dBA).