RT60 Acoustic Reverb Calculator
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This calculator is designed to give the RT60 delay value for the
room you describe in the area below. Area acoustics is a factor that
all in the music business have to learn to accept and work to our
own advantage. In the studio, knowledge might allow you to take
advantage to get some particular sound you wish to highlight. In
live sound, acoustics can be a problem without the knowledge of why
they react as they do. Either way we all should know and learn
something about acoustics. In the early 1920s, an early experimenter
in room and area acoustics, Wallace Sabine derived the formula which
is used by this calculator, and is the foundation for all acoustic
studies and calculations. RT60 is an acoustical measurement used to
calculate reverb time decay. RT60 is in reality the measurement of
time it takes a given audio signal to fall -60db (decibels). The
formula is RT60 = k*(V/Sa). In this formula, k is a constant that
equals 0.161 when the units of measurement are metric (in meters for
our use) and 0.049 when units are expressed in feet. Measurements
are to the closest whole meter or foot for most purposes, though you
may enter decimal values. (You MUST remain uniform in values of feet
or meters throughout.) Sa is the total surface absorption of a room
expressed in Sabins, named after the creator. It is a sum of all the
surface areas in the room multiplied by their respective absorption
coefficients. The absorption coefficients express the absorption
factor (characteristics) of materials at given frequencies. The
figures used in this calculator come from the Table Of Absorption
Coefficients for various materials, published by the National
Department of Measurements, concerning area acoustics. This same
table is used by virtually every building materials manufacturer for
product information. In this calculator, enter the measurements of
the room. Make sure you specify the units as feet or meters. Then
select the wall and interior materials that are appropriate, as well
as the quantity. Select the sound frequency as best possible. Click
on Calculate for the results. You may click on Clear Values to start
over.
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