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  2. Jim Fosgate - Wikipedia

    en.wikipedia.org/wiki/Jim_Fosgate

    James M. Fosgate (December 5, 1937 – December 7, 2022) [1] was an American inventor, engineer and businessman. The self-taught son of a television and radio repairman, Fosgate invented the first car amplifier in 1973 and founded Fosgate Electronics, now called Rockford Fosgate.

  3. Blaupunkt - Wikipedia

    en.wikipedia.org/wiki/Blaupunkt

    On 12 July 2012, Blaupunkt signed an agreement with Rockford Fosgate granting the Rockford Corporation exclusive distribution rights for the company's car multimedia and headphones range for the North American market. Rockford Fosgate sold Blaupunkt products, including car radios, navigation, amplifiers, loudspeakers, rear seat entertainment ...

  4. 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 ...

  5. Wolfbox - Wikipedia

    en.wikipedia.org/wiki/Wolfbox

    The Wolfbox is the name for the original passive DI unit, direct box, or DI as invented in the late 1950s by Dr. Edward Wolfrum, PhD, alumnus engineer of Motown, Golden World Records, Terra-Shirma Studios, Metro-Audio Capstan Roller Remote recording, and United Sound Systems in Detroit, Michigan.