Comparison of earphone and sound field methods for estimating noise attenuation of foam earplugs

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      <subfield code="a">The Real Ear Attenuation at Threshold (REAT) of ear foam earplugs was determined, using three methods of presentation of the test tones during a single fitting of the earplug. The three presentation methods were (a) sound-field listening; (b) TDH49 earphone mounted in the shell of a circumaural earmuff; and (c) TDH49 earphone in a model 51 cushion. Threshold were tested once under each condition</subfield>
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      <subfield code="a">American Industrial Hygiene Association journal</subfield>
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      <subfield code="t">American Industrial Hygiene Association journal</subfield>
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      <subfield code="g">Vol. 54, nº 6, June 1993 ; p. 307-312</subfield>
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