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In the past, designing concert halls with good acoustics was much less
of a scientific process; an acoustically successful concert hall was often
the product of good luck. Once a decent hall was designed, architects
would copy the model in an attempt to achieve the same acoustics, but
no one understood well what made one hall sound wonderful and another
appalling. As a result, many concert halls failed and were destroyed in
the process of natural selection. In the past century, however, the study
of architectural acoustics has developed into a more precise science.
The beginnings of architectural acoustics as a science originated at
Harvard University's Fogg Art Museum. Soon after the museum was built
in 1895, it was determined that its lecture hall had absolutely atrocious
acoustics. Wallace Clement Sabine, a young physics professor, was asked
to help. For the next three years, Sabine delved into the task of scientifically
testing the room acoustics, using a stopwatch, organ pipes and a number
of seat cushions. Fogg Art Museum's lecture hall never did measure up to standards for acceptable speech intelligibility and was eventually torn down. However, while attempting to fix the acoustics, Sabine developed a foundation for the science of architectural acoustics. He formulated an equation for reverberation time, relating it to room volume and materials. The unit for a material's sound absorption, the sabin, is named after him. Wallace Sabine is thus viewed as the father of modern architectural acoustics.
He was the first to quantify and measure factors that contribute to suitable
room acoustics. Since Sabine's experiments, physicists and engineers have
found that good acoustics depends on much more than just reverberation
time. These parameters, as well as the concept of reverberation time,
are explained further in the Discussion
section.
intro|shape|size|materials|history
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