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  2. Electro-Voice - Wikipedia

    en.wikipedia.org/wiki/Electro-Voice

    Electro-Voice RE-27N/D microphone. In 1963, EV received an Academy Award for their 642 Cardiline shotgun microphone, the first ever given for an audio product. [7] Electro-Voice launched its RE Series of microphones in the 1960s, notably the RE15, which was used extensively by musicians on television shows.

  3. Stereo-4 - Wikipedia

    en.wikipedia.org/wiki/Stereo-4

    Stereo-4, also known as EV (from Electro-Voice) or EV-4, was a matrix 4-channel quadraphonic sound system developed in 1970 by Leonard Feldman and Jon Fixler. [1]The system was heavily promoted by RadioShack stores in the United States, and some record companies released LP albums encoded in this format.

  4. Electro-Voice RE20 - Wikipedia

    en.wikipedia.org/wiki/Electro-Voice_RE20

    The Electro-Voice RE20 is an American professional cardioid dynamic microphone, commonly used in broadcasting applications since 1968. Designed by Electro-Voice using the company's patented Variable-D technology and a large-diaphragm element, it has been described as an industry standard "iconic" microphone for its natural sound and its wide ...

  5. Thiele/Small parameters - Wikipedia

    en.wikipedia.org/wiki/Thiele/Small_parameters

    The 1925 paper [1] of Chester W. Rice and Edward W. Kellogg, fueled by advances in radio and electronics, increased interest in direct radiator loudspeakers. In 1930, A. J. Thuras of Bell Labs patented (US Patent No. 1869178) his "Sound Translating Device" (essentially a vented box) which was evidence of the interest in many types of enclosure design at the time.

  6. List of EMD locomotives - Wikipedia

    en.wikipedia.org/wiki/List_of_EMD_locomotives

    The following is a list of locomotives produced by the Electro-Motive Corporation (EMC), and its successors General Motors Electro-Motive Division (GM-EMD) and Electro-Motive Diesel (EMD). Streamlined power cars and early experimental locomotives

  7. EL34 - Wikipedia

    en.wikipedia.org/wiki/EL34

    The EL34 is a thermionic vacuum tube of the power pentode type. The EL34 was introduced in 1955 by Mullard, which was owned by Philips. [1] The EL34 has an octal base (indicated by the '3' in the part number) and is found mainly in the final output stages of audio amplification circuits; it was also designed to be suitable as a series regulator by virtue of its high permissible voltage between ...

  8. Electrodynamic speaker driver - Wikipedia

    en.wikipedia.org/wiki/Electrodynamic_speaker_driver

    In a ribbon speaker, the voice coil may be printed or bonded onto a sheet of very thin paper, aluminum, fiberglass or plastic. This cone, dome or other radiator is mounted at its outer edge by a flexible surround to a rigid frame which supports a permanent magnet in close proximity to the voice coil. For the sake of efficiency, the relatively ...

  9. Ad Lib, Inc. - Wikipedia

    en.wikipedia.org/wiki/Ad_Lib,_Inc.

    After development work on the AdLib Music Synthesizer Card had concluded, the company struggled to engage the software development community with their new product. As a result, Ad Lib partnered with Top Star Computer Services, Inc., a New Jersey company that provided quality assurance services to game developers.