Abstract:The attenuation provided by seven different circumaural hearing protectors on the newly-standarized aluminum artifical head was measured for parallel and perpendicular sound incidence. The impulse sound source was a 38-caliber handgun shooting blanks, which created a 150-dB re 20 μPa peak sound pressure level with an A-duration of 0.13 ms. The ear protector was 1 m from the gun. The incident noise impulse external to the ear protector was measured with a “1/8-in.” condenser microphone and the resultant noise i… Show more
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