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2. Earmuffs - Wikipedia

   en.wikipedia.org/wiki/Earmuffs

   A microphone, circuit, and speaker inside the muff are used to actively cancel out noise. As a signal enters the microphone, the electronics within the earmuff cast a signal back that is 180° out of phase with the signal, thus "cancelling" this signal. [23] This opposing signal reduces the amplitude of the waveform and reduces the signal.

3. The 13 Best Earmuffs to Up Your Winter Accessory Game - AOL

   www.aol.com/lifestyle/13-best-earmuffs-winter...

   Esme Ear Muffs. Turn to Apparis for an eco-minded style. Crafted from a plant-based fur, you can rest assured that this is the most sustainable option. Materials: Modacrylic, metallic yarn.

4. Hearing protection device - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_device

   Earmuffs, external: This ear protection fits snug around the person's external ear. Earplugs, internal: These are ear protection that fit inside of the person's ear canal. There are many different types of ear plugs. The most commonly known are foam, musician, or custom earplugs that are made from a mold of a person's ear.

5. Hearing protection fit-testing - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_fit-testing

   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.

6. Bowers & Wilkins C5 headphones ooze luxury into your ear ...

   www.aol.com/news/2011-07-12-bowers-and-wilkins-c...

   Well then, maybe you'll be pleased hear about the company's new and extra-mobile $180 C5 noise-isolating in-ear headset. Crafted mostly from aluminum, its bullet-shaped earbuds look like a posh ...

7. Earplug - Wikipedia

   en.wikipedia.org/wiki/Earplug

   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 ...