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Acoustics of Concert Halls and Rooms
SOME BASICS OF
ARCHITECTURAL ACOUSTICS
Auditorium Acoustics
Science of Sound, Chapter 23
Principles of Vibration and Sound,
Chapter 11
Kimmel Center

Free field
Reflections
p vs r log p vs log r
SOUND FIELD

Sound decay
Sound decay in a
400 m3 classroom
Sound pressure level as a
function of time for that room

GROWTH AND DECAY OF REVERBERANT SOUND
RT = K (volume / area)
RT = 0.161 V/A (V in m3; A in m2 )
If room dimensions are given in feet, the formula may be written:
RT= 0.049 V/A (V in ft.3 ; A in ft.2 )

Decay of reverberant sound
(a) and (b) are decay curves of sound pressure and sound
level in a room with uniform energy distribution
(c) shows different initial and final reverberation times
(d) shows peaks due to prominent standing waves or room
resonances

CALCULATING REVERBERATION TIME

Desirable
reverberation times
for various sizes and
functions
Variation of
reverberation time
with frequency in
good halls

McDermott
Concert
Hall
(Dallas)

Meyerhof
Symphony
Hall
(Baltimore)

?Spatial impression
?Intimacy
?Early decay time
?Clarity
?��Warmth��
Important criteria for
concert halls:

Concert
halls
throughout
the
World

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1 auditorium acoustics

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