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  2. The 6 Best Sound Machines for a Restful Night's Sleep - AOL

    www.aol.com/6-best-sound-machines-restful...

    Tisch recommends this white noise machine, which features 14 different sound options to lull you to sleep. "White noise, calming ocean waves, the soothing fall of rain, and more," she notes of ...

  3. 8 white noise machines for better sleep - AOL

    www.aol.com/news/8-white-noise-machines-better...

    Hatch Restore 2 $ at Amazon. Hatch Restore 2 $ at Target. Hatch Restore 2 $ at Hatch.co. The Hatch Restore 2 is a cross between a sunrise alarm clock and a sound machine that enables you to play ...

  4. 5 Great Sound Machines That Will Transform Your Sleep - AOL

    www.aol.com/5-great-sound-machines-sleeping...

    In fact, this sound machine offers only the essentials, including a volume knob, a timer, and just six built-in sounds (White Noise, Thunder, Ocean, Rain, Summer Night, and Brook).

  5. White noise machine - Wikipedia

    en.wikipedia.org/wiki/White_noise_machine

    A white noise machine is a device that produces a noise that calms the listener [citation needed], which in many cases sounds like a rushing waterfall or wind blowing through trees, and other serene or nature-like sounds. Often such devices do not produce actual white noise, which has a harsh sound, but pink noise, whose power rolls off at ...

  6. Long-range acoustic device - Wikipedia

    en.wikipedia.org/wiki/Long-range_acoustic_device

    A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance. It has been used as a method of crowd control , which has caused permanent hearing damage , having an extremely high decibel capacity (up to 160 dB measured at one ...

  7. Active noise control - Wikipedia

    en.wikipedia.org/wiki/Active_noise_control

    A noise-cancellation speaker emits a sound wave with the same amplitude but with an inverted phase (also known as antiphase) relative to the original sound. The waves combine to form a new wave, in a process called interference , and effectively cancel each other out – an effect which is called destructive interference .

  8. These Sound Machines Help You Doze Off Fast and Sleep ... - AOL

    www.aol.com/lifestyle/sound-machines-help-doze...

    The best sound machines offer multiple noises, come with timers, and allow you to adjust the volume. Shop options from Hatch, Loftie, and Yogasleep now. These Sound Machines Help You Doze Off Fast ...

  9. Drown Out the Noise and Sleep Soundly With These Sound Machines

    www.aol.com/drown-noise-sleep-soundly-sound...

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