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Acoustics. Determination of sound power levels of noise sources using sound pressure. Engineering method in an essentially free field over a reflecting plane Ingestion-build-256245 mattress padAcoustics Determination of sound power levels of noise sources using sound pressure Engineering method in an essentially free field over a reflecting plane Executive summary Requirements for measuring sound pressure and sound power levels of noise sources. Abstract This International Standard specifies a method for measuring the sound pressure levels on a measurement surface enveloping a noise source, under essentially free field conditions near one