SOUND ATTENUATION CHARACTERISTICS OF THE NAVY SPH-3 (MODIFIED) (LS) HELMET
ARMY AEROMEDICAL RESEARCH UNIT FORT RUCKER AL
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An evaluation of the real-ear sound attenuation characteristics of the Navy SPH-3 Modified LS Helmet was done with procedures and equipment specified by ASA Z24.22 - 1957. The results show that the SPH-3 Modified LS is a relatively efficient attenuator of sound throughout the audio spectrum. In view of the poor sound attenuation characteristics of the Army APH-5, it has been recommended that this helmet be replaced by the SPH-3 Modified LS.
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