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2. Do Loop earplugs actually work?

   www.aol.com/news/loop-earplugs-actually...

   Loop’s highest decibel earplug is the Loop Quiet; if you’re looking for something stronger with better noise reduction, consider Mack’s soft foam earplugs $10, which have 33 decibels SNR or ...

3. Earplug - Wikipedia

   en.wikipedia.org/wiki/Earplug

   Hearing protectors sold in the US are required by the EPA to have a noise reduction rating (NRR), [40] which is an estimate of noise reduction at the ear when protectors are worn properly. Real-ear attenuation at threshold (REAT) measurements are performed multiple times with 10 to 20 subjects to determine the NRR.

4. Hearing protection fit-testing - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_fit-testing

   The second earplug is then placed in the other ear and the procedure is repeated a third time. The required increase in loudness this time represents the noise reduction achieved in the second ear. The loudness balance fit-testing approach provides individual personal attenuation ratings for each ear. [26]

5. Hearing protection device - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_device

   In some occasions, multiple types of ear protection can be used together to increase the NRR. For example, foam earplugs can be worn in-conjunction with earmuffs. Each type of ear protection has what is called a noise reduction rating (NRR). This gives the consumer an estimate of how much noise is being reduced before reaching the individual's ear.

6. The 7 best OTC hearing aids for seniors, according to ... - AOL

   www.aol.com/lifestyle/the-7-best-otc-hearing...

   Extra features: Many hearing aids offer additional features such as rechargeable batteries, directional microphones, wind noise reduction, extended battery life, and advanced noise cancellation ...

7. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   Noise cancellation to eliminate ambient noise is never passive because of the circuitry required, so references to passive noise cancellation actually are referring to products featuring sound isolation. To prevent higher-frequency noise from reaching the ear, most noise-cancelling headphones depend on sound isolation or soundproofing.