Index
Page references followed by “f” denote figures; those followed by “t” denote tables
A
Absorbers
low frequency active, 220
mechanically resonant, diaphragmatic, 219, 476
acoustically resonant, Helmholtz, 220, 477
resistive,
historical origins, 17,
fibrous and foam materials, 217, 219, 476–477
random incidence absorption coefficients, 482f
directional absorption coefficients, 483
thickness requirements, 494
Absorption coefficients, audience, concert, 44f, 84, 474, 479, 484, 493
carpet, 478f
defined and discussed, 472–476
diffusers with and without fabric cover, 508
drapes, 478f
fiberglass (and mineral wool and foam slab)
random incidence, 482f
random incidence, with air space behind, ...
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