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  2. Are Noise-Canceling Headphones Harmful to Your Ears? - AOL

    www.aol.com/noise-canceling-headphones-harmful...

    And while over-the-ear headphones can help close off more outside noise (than earbuds), it’s still important to keep the maximum volume at 70% or less to maintain hearing health. __wf_reserved ...

  3. Active noise control - Wikipedia

    en.wikipedia.org/wiki/Active_noise_control

    Noise control is an active or passive means of reducing sound emissions, often for personal comfort, environmental considerations, or legal compliance. Active noise control is sound reduction using a power source. Passive noise control is sound reduction by noise-isolating materials such as insulation, sound-absorbing tiles, or a muffler rather ...

  4. 2channel - Wikipedia

    en.wikipedia.org/wiki/2channel

    5channel5ちゃんねる. 2channel (Japanese: 2ちゃんねる, Hepburn: ni channeru), also known as 2ch, [5] Channel 2, [6][7] and sometimes retrospectively as 2ch.net, [8] was an anonymous Japanese textboard [b] founded in 1999 by Hiroyuki Nishimura. Described in 2007 as "Japan's most popular online community", [9] the site had a level of ...

  5. Absolute threshold of hearing - Wikipedia

    en.wikipedia.org/wiki/Absolute_threshold_of_hearing

    Absolute threshold of hearing. The absolute threshold of hearing (ATH), also known as the absolute hearing threshold or auditory threshold, is the minimum sound level of a pure tone that an average human ear with normal hearing can hear with no other sound present. The absolute threshold relates to the sound that can just be heard by the ...

  6. Hearing range - Wikipedia

    en.wikipedia.org/wiki/Hearing_range

    Logarithmic chart of the hearing ranges of some animals [1] [2] Hearing range describes the frequency range that can be heard by humans or other animals, though it can also refer to the range of levels. The human range is commonly given as 20 to 20,000 Hz, although there is considerable variation between individuals, especially at high ...

  7. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. SBC (codec) - Wikipedia

    en.wikipedia.org/wiki/SBC_(codec)

    SBC (codec) SBC, or low-complexity subband codec, is an audio subband codec specified by the Bluetooth Special Interest Group (SIG) for the Advanced Audio Distribution Profile (A2DP). [1] SBC is a digital audio encoder and decoder used to transfer data to Bluetooth audio output devices like headphones or loudspeakers.

  9. Sound pressure - Wikipedia

    en.wikipedia.org/wiki/Sound_pressure

    TL. v. t. e. Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average or equilibrium) atmospheric pressure, caused by a sound wave. In air, sound pressure can be measured using a microphone, and in water with a hydrophone. The SI unit of sound pressure is the pascal (Pa).