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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 ...
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.
Old connectors. On the top is a TRS socket. Plugs are below. The leftmost is a TRS plug; the rest are TS plugs. Modern profile 1 ⁄ 4 in TS plugs. Henry P. Clausen filed a patent [19] in 1901 for improved construction of the telephone switchboard-plug with today's 1 ⁄ 4 inch TS form still used on audio equipment.
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