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  3. Subwoofer - Wikipedia

    en.wikipedia.org/wiki/Subwoofer

    From about 1900 to the 1950s, the "lowest frequency in practical use" in recordings, broadcasting and music playback was 100 Hz. [9] When sound was developed for motion pictures, the basic RCA sound system was a single 8-inch (20 cm) speaker mounted in straight horn, an approach which was deemed unsatisfactory by Hollywood decisionmakers, who hired Western Electric engineers to develop a ...

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  5. Velodyne - Wikipedia

    en.wikipedia.org/wiki/Velodyne

    Velodyne Acoustics GmbH, commonly known as Velodyne, is a company that makes subwoofers and related products and was originally founded by David Hall in Silicon Valley, California, in 1983 and was then purchased in 2019 by Audio Reference of Hamburg, Germany, and its owner Mansour Mamaghani.

  6. Rotary woofer - Wikipedia

    en.wikipedia.org/wiki/Rotary_woofer

    A rotary woofer is a subwoofer-style loudspeaker which reproduces very low frequency content by using a conventional speaker voice coil's motion to change the pitch (angle) of the blades of an impeller rotating at a constant speed. The pitch of the fan blades is controlled by the audio signal presented to the voice coil, and is able to swing ...

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