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A pair of universal IEM earpieces (Etymotic ER-4S)The in-ear monitors themselves are the last stage of the signal path in the system. They are placed in the external ear canal and seal against its sides; the effectiveness of this seal is a major part of the effectiveness of the IEM.
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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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 ...
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Harvey left Ultimate Ears in 2007 after designing and producing the UE-10 Pro and then the UE-11, the first 3-way and 4-way (respectively) IEM products from Ultimate Ears. [9] Harvey said he was "forced out" by Allison who wished to strengthen his position as leader. [10] Ultimate Ears was acquired by Logitech in August 2008. [11]
Some in-ear headphones utilize built-in microphones to allow some outside sound to be heard when desired. [44] [45] Generic or custom-fitting ear canal plugs are made from silicone rubber, elastomer, or foam. Such plugs in lower-end devices may be interchangeable, which increases the risk of them falling off and getting lodged in the ear canal.
In the ear aids (ITE) devices fit in the outer ear bowl (called the concha). Being larger, these are easier to insert and can hold extra features. [16] They are sometimes visible when standing face to face with someone. ITE hearing aids are custom made to fit each individual's ear. They can be used in mild to some severe hearing losses.