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Constant-voltage speaker systems are also commonly referred to as 25-, 70-, 70.7-, 100 or 210-volt speaker systems; distributed speaker systems; or high-impedance speaker systems. In Canada and the US, they are most commonly referred to as 70-volt speakers. In Europe, the 100 V system is the most widespread, with amplifier and speaker products ...
The Crown DC300, introduced in 1967, helped define the era of modern power amplifiers [5] In 1959, Crown began making standalone tube power amplifiers. By 1963, solid state electronics development allowed Crown to produce a more robust tape recorder, and in 1964, their first solid state power amplifier: the low-profile SA 20-20. [2]
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.
JBL currently serves the home and professional audio markets. Their professional products include live PA systems, studio monitors, and loudspeakers for cinema. Their home products include home audio speakers, waterproof Bluetooth speakers, and high-end car audio. JBL is owned by Harman International, a subsidiary of Samsung Electronics.
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.
The preamplified signals then pass into the amplifiers. Depending on local practices, these amplifiers usually amplify the audio signals to 50 V, 70 V, or 100 V speaker line level. [16] Control equipment monitors the amplifiers and speaker lines for faults before it reaches the loudspeakers.
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