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2. Crown International - Wikipedia

   en.wikipedia.org/wiki/Crown_International

   The first grounded bridge product released by Crown was the M600 amplifier (1974) primarily employed for commercial sound installations including constant voltage loudspeaker systems. [8] Crown received a patent for the invention in 1974. [9] After proving itself in the field, the topology was used to design the Microtech MT-1000 in 1984. [7]

3. List of bass amplifier and loudspeaker manufacturers

   en.wikipedia.org/wiki/List_of_bass_amplifier_and...

   This article lists manufacturers of bass amplifiers, loudspeakers, and other amplification-related items such as preamplifiers. The amplifiers and loudspeakers used to amplify bass instruments (e.g., the bass guitar, double bass and similar instruments) are distinct from other types of amplification systems due to the particular challenges associated with low-frequency sound reproduction.

4. Harman Kardon - Wikipedia

   en.wikipedia.org/wiki/Harman_Kardon

   Harman Kardon designed and produced some of the first high fidelity audio products in the 1950s. The company's first product was an FM tuner.. Early integrated receivers (with a tuner, preamplifier and power amplifier) were an attempt to create, improve and produce high fidelity performance in a single unit.

5. Harman International - Wikipedia

   en.wikipedia.org/wiki/Harman_International

   Promotional vehicle at Geneva International Motor Show 2019. In the 1960s, Harman Kardon acquired other audio companies such as JBL. [8] In the 1970s, Harman accepted an appointment in the Carter administration as United States Deputy Secretary of Commerce and sold his company to conglomerate Beatrice Foods to avoid a conflict of interest.

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

7. Constant-voltage speaker system - Wikipedia

   en.wikipedia.org/wiki/Constant-voltage_speaker...

   In 1987, Crown introduced the Macrotech 2400, capable of driving 100-volt lines directly. [3] Since then, further developments in high-power amplifier technology have widened the choices. Many manufacturers make amplifiers capable of direct connection to a high-impedance constant-voltage speaker line.