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The Behaviour of Sound in Rooms
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absorbent absorption coefficient acoustical design air-borne sound insulation amount of absorption attenuation audience auditorium average building calculated column Concrete floor construction decibels depend direct sound distance door duct dyn/cm2 echo effect example flat floating floor floor finish frequency range front given hall Helmholtz Resonator higher frequencies impact sound insulation indirect transmission intensity inverse square law Joist floor less listener loudness loudspeaker low-frequency machine material measured metres microphone milliseconds mineral wool noise level noise measurements noise source normal octave band orchestra overall insulation panel partition path phons plastered platform position possible practical radiate reason receiving room reduce reflected sound resilient reverberant sound level Royal Festival Hall sabins screen seat shown in Fig side soffit solid sound pressure sound waves sound-absorbent space speaker speech studio suspended ceiling thick tion usually values vibration voltage volume wavelength wind gradient