Why Reverberation Time (RT) Is Important
What is Reverberation Time?
Sound reflections are created when noise reverberates and echoes around
architectural spaces. Reverberation Time (RT) is the acoustical concept
which measures how long, in seconds, it takes for these noises to become
The Importance of Sound Quality
Measuring Reverberation Time is important to determine the sound quality of
speech and music in acoustical spaces. Instructional spaces, such as classrooms,
are best with short RTs – less than 1 second to ensure clarity and high speech
intelligibility. ANSI has set forth criteria and standards with recommendations
for the maximum acceptable RT in these areas. Auditoriums, theaters, and other
musical spaces will benefit from longer RTs, typically greater than 1.5 seconds.
The Relationship Between Architectural Design and Reverberation Time
RT = Constant (Volume/Absorption)
RT is determined by looking at both the volume and absorption rate in an
acoustical space. The volume of a space is proportional to the RT of that space;
the greater the volume, the longer the RT. Inversely, the amount of
sound-absorbing material in any space will have a negative effect on the RT.
As an example, a large space with tiled floors and a drywall ceiling will
have a long RT. Oppositely, a small room with a low suspended ceiling and
high-pile carpet will have a much shorter RT.
Create the best room for your needs – determine the RT of your space and let us
help you choose the correct acoustical materials for your space.