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2. Equal-loudness contour - Wikipedia

   en.wikipedia.org/wiki/Equal-loudness_contour

   An equal-loudness contour is a measure of sound pressure level, over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones. [1] The unit of measurement for loudness levels is the phon and is arrived at by reference to equal-loudness contours. By definition, two sine waves of differing ...

3. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   Noise -cancelling headphones alongside a carry case. Noise-cancelling headphones are headphones which suppress unwanted ambient sounds using active noise control. This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing . Noise cancellation makes it possible to listen to audio ...

4. The best wireless earbuds - AOL

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   Jabra Elite 3 $ at Amazon. Jabra Elite 3 $ at Best Buy. Jabra Elite 3 $ at ebay. Best splurge: Sony WF-1000XM4 Pros: Excellent sound quality and noise canceling.. Cons: Large, heavy design. The ...

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   Best Prime Day headphones and earbuds deals: Philips H6506 On-Ear Wireless Headphones, $50 (was $100), amazon.com Bose SoundSport Wireless In-Ear Headphones, $99 (was $149), amazon.com

6. Take 20% Off Raycon Earbuds, Headphones and Speakers ... - AOL

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   These Basic Earbuds. The Work Earbuds Classic. Raycon. For everyday wear that’s easy to take in and out, these buds are the perfect pick! See it! Get The Work Earbuds Classic (originally $120 ...

7. Noise reduction coefficient - Wikipedia

   en.wikipedia.org/wiki/Noise_reduction_coefficient

   The noise reduction coefficient (commonly abbreviated NRC) is a single number value ranging from 0.0 to 1.0 that describes the average sound absorption performance of a material. An NRC of 0.0 indicates the object does not attenuate mid-frequency sounds, but rather reflects sound energy. This is more conceptual than physically achievable: even ...