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Various earmuff hearing protectors. Sound levels of some daily activities. 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.
For example, if wearing an earplug with a NRR of 25 dB and an earmuff with an NRR of 20 dB, the combined protection would not be 45 dB. Instead, 5 dB should be added to the higher of the two NRRs. [26] In the preceding example, the combined earmuff and earplug NRR would be estimated at 30 dB (25 dB plus 5).
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 ...
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.
All RIC options are Bluetooth-enabled. One of the RIC models also offers CROS for single-sided hearing loss. ITE: Two in–the–ear models are available in six colors and four technology levels.
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