Hearing protector attenuation is most often evaluated through REAT measurements, but can be assessed with a microphone in real ear or using an acoustic test fixture. The HLR program constructed an acoustic test fixture to digitally record the acoustic transfer function of HPDs in an impulsive environment. HLR program staff evaluated the effectiveness of more than twenty hearing protectors at indoor and outdoor firing ranges with impulses generated by small-caliber weapons and peak impulse levels ranging from 140 to 170 dB SPL and data was presented and published.
Kardous CA, Franks JR, Davis RR . NIOSH/NHCA Best practices workshop on impulsive noise. Noise Control Engineering Journal, 53 (2) 53-60.
Tubbs, RL, Murphy, WJ. . NIOSH Health Hazard Evaluation Report: HETA #2002-0131-2898 Fort Collins Police Services, Fort Collins, Colorado. DHHS-CDC-NIOSH, March .
Franks JR, Murphy WJ. . Do sound restoration hearing protectors provide adequate attenuation for gunfire noise. J. Acoust. Soc. Am., Vol. 112 No. 5 Pt. 2, 2294.
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Page last reviewed: July 23, 2007
(archived document) Content Source: National Institute for Occupational Safety and Health (NIOSH)