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  2. List of discontinued Bose headphones - Wikipedia

    en.wikipedia.org/wiki/List_of_discontinued_Bose...

    Unlike its predecessors, the QC25s can be used (without the noise cancelling function) while the battery is dead. Another change is the elimination of the Hi/Low switch which increased the input gain for low-output sources like MP3 players. In 2015, the QC25s won the What Hi-Fi? Sound and Vision annual award for "Best Noise Cancelling Headphones".

  3. Samsung Galaxy Buds series - Wikipedia

    en.wikipedia.org/wiki/Samsung_Galaxy_Buds_series

    The Buds 2 Pro include active noise cancellation, 24-bit Hi-Fi audio support (only for Samsung device with One UI 4.0 or above) and enhanced 360-degree audio. They were released on August 26, 2022, with a launch price of $229.99, a $30 price increase compared to the original Galaxy Buds Pro.

  4. Health effects from noise - Wikipedia

    en.wikipedia.org/wiki/Health_effects_from_noise

    Approximately 35% to 40% of office workers find noise levels from 55 to 60 dB(A) extremely irritating. [5] The noise standard in Germany for mentally stressful tasks is set at 55 dB(A), [47] however, if the noise source is continuous, the threshold level for tolerability among office workers is lower than 55 dB(A). [5]

  5. Dolby noise-reduction system - Wikipedia

    en.wikipedia.org/wiki/Dolby_noise-reduction_system

    A Dolby noise-reduction system, or Dolby NR, is one of a series of noise reduction systems developed by Dolby Laboratories for use in analog audio tape recording. [1] The first was Dolby A, a professional broadband noise reduction system for recording studios in 1965, but the best-known is Dolby B (introduced in 1968), a sliding band system for the consumer market, which helped make high ...

  6. Boeing B-52 Stratofortress - Wikipedia

    en.wikipedia.org/wiki/Boeing_B-52_Stratofortress

    On 22 November 1972, a B-52D (55-110) from U-Tapao was hit by a SAM while on a raid over Vinh. The crew was forced to abandon the damaged aircraft over Thailand. This was the first B-52 destroyed by hostile fire. [171] [172] [173]

  7. Noise pollution - Wikipedia

    en.wikipedia.org/wiki/Noise_pollution

    For instance, all sites whose environmental or community noise exposure exceeds the day night average sound level (DNL) of 65 (dB) are considered noise-impacted areas, it defines "Normally Unacceptable" noise zones where community noise levels are between 65 and 75 dB, for such locations, noise abatement and noise attenuation features must be ...

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