A warehouse is 75 ft x 45 ft with a 25-ft ceiling the walls, Ask an Expert

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A warehouse is 75 ft x 45 ft with a 25-ft ceiling. The walls, floor, and ceiling have absorption coefficients of 0.1, 0.1, and 0.4, respectively, in the 1000-Hz octave bend. An acoustically isotropic pneumatic machine produces a sound pressure level of 96 dB at a distance of 30 ft from the machine. What is the sound pressure level in the 1-kHz band at a position 10 ft from the source?

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