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Impulse Assessment of the ComTac (trademark) V Hearing Defender Headset and the Howard Leight (trademark) MAX (registered trademark) Small Earplug
[Technical Report, Technical Memo]
NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT
Pagination or Media Count:
This technical memorandum describes the IPIL testing conducted on a combined configuration that included the Howard Leight trademark MAX registered trademark Small Earplug and the ComTac trademark V Headset. Testing included two test modes for the ComTac trademark V passive and active. Testing was completed in accordance with the ANSI standard S12.42-2010. All device samples were tested at the nominal levels of 160 and 170 decibel peak dBP, re 20 muPa. A total of five samples were fitted to an acoustic test fixture two times each for a total of 10 trials per test level in both test modes. The mean and standard deviation SD IPIL values at 160 dBP were 53.1 2.5 dB SPL for the passive mode, and 53.9 1.7 dB SPL for the active mode. Results at 170 dBP showed mean SD IPIL values of 55.0 2.1 dB SPL for the passive mode, and 55.8 1.9 dB SPL for the active mode. These results suggest that the ComTac V trademark Headset, when functioning properly and fitted in combination with the Howard Leight trademark MAX registered trademark Small earplugs can adequately protect against impulses below 180.0 dBP in both the passive and the active test modes.
[A, Approved For Public Release]