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  2. Peter L. Jensen - Wikipedia

    en.wikipedia.org/wiki/Peter_L._Jensen

    Jensen and Pridham moved from Napa in 1916, and changed the company name in 1917 to the Magnavox Company. Jensen was employed as chief engineer until 1925. [6] He built with Edwin S. Pridham the first moving coil loudspeaker in 1915. [7] Called the moving coil principle, the electro-dynamic principle from which the term dynamic speaker later ...

  3. Invoke (smart speaker) - Wikipedia

    en.wikipedia.org/wiki/Invoke_(smart_speaker)

    Invoke (stylized as INVOKE) was a smart speaker developed by Harman Kardon.It was powered by Microsoft's intelligent personal assistant, Cortana. [2] [3] Voice interaction with Cortana provides features such as setting alarms, facts, searches, weather, news, traffic, flights, and other real-time information.

  4. Powered speakers - Wikipedia

    en.wikipedia.org/wiki/Powered_speakers

    An active full-range loudspeaker. Powered speakers, also known as self-powered speakers and active speakers, are loudspeakers that have built-in amplifiers.Powered speakers are used in a range of settings, including in sound reinforcement systems (used at live music concerts), both for the main speakers facing the audience and the monitor speakers facing the performers; by DJs performing at ...

  5. Napa Valley AVA - Wikipedia

    en.wikipedia.org/wiki/Napa_Valley_AVA

    Napa Valley is an American Viticultural Area (AVA) in Napa County, California. The area was established by the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) on February 27, 1981, after a 1978 petition submitted by the Napa Valley Vintners and the Napa Valley Grape Growers Association.

  6. Loudspeaker - Wikipedia

    en.wikipedia.org/wiki/Loudspeaker

    The term loudspeaker may refer to individual transducers (also known as drivers) or to complete speaker systems consisting of an enclosure and one or more drivers.. To adequately and accurately reproduce a wide range of frequencies with even coverage, most loudspeaker systems employ more than one driver, particularly for higher sound pressure level (SPL) or maximum accuracy.

  7. Fog machine - Wikipedia

    en.wikipedia.org/wiki/Fog_machine

    A fog machine, fog generator, or smoke machine is a device that emits a dense vapor that appears similar to fog or smoke. This artificial fog is most commonly used in professional entertainment applications, but smaller, more affordable fog machines are becoming common for personal use. Fog machines can also be found in use in a variety of ...