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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 ...
[26] [27] [28] This phenomenon can be caused by the mechanical coupling between the earplug and earmuff through the human tissues, the vibration of the ear canal wall, or the bone conducted sound travelling from the head and body directly to the middle and inner ears.
The main difference between earmuffs and earplugs, is that earmuffs are not inserted inside the ear canal. Instead the muffs create a seal around the outside of the ear to prevent noise from reaching the inner ear. Earmuffs are easy to wear and often provide a more consistent fit than an earplug.
As mentioned above, the main difference is whether the tubing or the speaker is directly attached to the earmold. An earmold on a RIC hearing aid will either be: encased or detachable.
Hearing protector fit-testing is a method that measures the degree of noise reduction obtained from an individual wearing a particular hearing protection device (HPD) - for example, a noise canceling earplug or earmuff. Fit testing is necessary due to the fact that noise attenuation varies across individuals.
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