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Using both ear muffs (whether passive or active) and earplugs simultaneously results in maximum protection, but the efficacy of such combined protection relative to preventing permanent ear damage is inconclusive, with evidence indicating that a combined noise reduction ratio (NRR) of only 36 dB (C-weighted) is the maximum possible using ear ...
Choosing the most appropriate hearing protection device, both with appropriate level of attenuation and appropriate fit for the individual. [5] Ideally, the device should limit the sound intensity that reaches the ear to levels below 85 dBA. If the attenuation does not limit the noise levels to that level, other alternatives should be sought.
A hearing protection device, also known as a HPD, is an ear protection device worn in or over the ears while exposed to hazardous noise and provide hearing protection to help prevent noise-induced hearing loss. HPDs reduce the level of the noise entering the ear.
Depending on version and required protection level MEXAS can protect against kinetic energy penetrators like 30 mm AP, RPGs and mines like the TM-46 mine and TMRP-6 [3] In order to reach different types of desired armour protection MEXAS is either passive armour or non-explosive reactive armour. [4]
Firearms range from a noise level of 140 dB to 175 dB depending on the firearm type. It is recommended to use dual hearing protection (earmuffs and earplugs together) when using firearms. [10] Exposure to loud noises damages the hair cells in the inner ear that are essential for sending neural impulses to the brain in order to perceive sounds.
Armor Level Protection NIJ HG1 9mm Luger.357 Magnum: This armor would protect against: 124 grain 9mm Luger Full Metal Jacketed Round Nose (FMJ RN) at a velocity of 1305 ft/s (398 m/s) 158 grain .357 Magnum Jacketed Soft Point (JSP) at a velocity of 1430 ft/s (436 m/s). This is roughly equivalent to the obsolete NIJ Level II ballistic protection ...
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