ASTM E596-96 Laboratory Measurement of Noise Reduction of Sound- Isolating Enclosures

ASTM E596-96 test method determines the noise reduction of sound isolating enclosures. It provides details about the noise isolation class by measuring the noise reduction. The enclosure is placed in a reverberation room to ensure safe and proper testing. The final results of this method are displayed keeping in view the international standards.

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    ASTM E596-96 test method covers the measurement of noise reduction of sound isolating enclosures when placed in a reverberation room. This gives details about the sound-isolating enclosures and helps in ranking them with respect to noise isolation class. The results obtained from this method help in quality control, research, and performance evaluation of various sound-isolating enclosures. 


    The sound-isolating enclosure is prepared and placed in a reverberation room. The noise levels are adjusted and measured with respect to one-third octave bands.  The one-third octave band sound pressure is measured on the onset of bands of random noise. The noise reduction data is taken and stands for the difference between the space-averaged sound pressure level in the reverberation room and that in the enclosure. The noise isolation data then helps in the determination of the noise isolation class.

    Specimen Size:

    Specimen size should be as per the requirements. In this case, a one-third octave filter set is used with its frequency varying from 125 to 4000 Hz. The signal level should be at least 10 dB above the background noise level.  


    The signal level is corrected by applying the formula if the background noise level is between 5 and 10dB, where ‘L’ stands for the signal level, and ‘NR’ stands for the noise reduction.


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