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Properties of Sound
How We Hear
Speech and Music
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absorption coefficient absorptive material absorptive treatment acoustical design acoustical materials air space amount approximately architectural acoustics attenuation audience auditorium average balcony blanket building Celotex Corp cent Chapter church concrete slab construction cubic feet curve cycles cycles cycles decay decibels diffraction diffusion distance duct echoes effects example fiberboard fibers floor glass grille gypsum hearing inches increases lath listening located loudness loudspeakers low frequencies microphone mineral wool music rooms nailed National Physical Laboratory noise level noise-insulation open-air theater optimum reverberation painted panels partitions Perforated plywood quency quiet rear wall reduced resonant frequencies room noise sabins shown in Fig side walls sorptive sound insulation sound level sound pressure sound waves sound-absorptive sound-amplification system sound-pressure level speaker speech and music splays sq ft square studios studs Table thick tile tion tone transmission loss transmitted usually ventilating vibration walls and ceiling wavelength wood wool