Why do many headphones have output frequency of 5Hz to 22000Hz even though humans can hear 20 to 20000Hz only? - Quora
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Headphones - In-Ear HD Stereo Noise Cancelling Sweatproof Sport Earphones Earbuds Flat Wired with Apple iOS Samsung and Android Compatible Microphone and Remote (White 2-Pack) - Walmart.com
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