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Polk Audio was founded by Matthew Polk, George Klopfer and Sandy Gross in 1972. The three first met one another while attending classes at Johns Hopkins University in Baltimore . After graduating in 1971, the team collaborated on producing a sound system for a local bluegrass music convention.
Wireless speakers are loudspeakers that receive audio signals using radio frequency (RF) waves rather than over audio cables. The two most popular RF frequencies that support audio transmission to wireless loudspeakers include a variation of WiFi IEEE 802.11, while others depend on Bluetooth to transmit audio data to the receiving speaker. [1]
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 ...
Play-Fi is a wireless protocol for multiroom audio based on the existing 802.11 specification (b/g/n). It emerged in late 2012 as an Android streaming protocol, with iOS support added in September 2013, and Windows support later, including audio/video sync. [45] The first Play-Fi speaker was the Phorus PS1, made by DTS subsidiary Phorus. [46]
The Speakon (stylized speakON) is a trademarked name for an electrical connector, [2] originally manufactured by Neutrik, mostly used in professional audio systems for connecting loudspeakers to amplifiers. Other manufacturers make compatible products, [3] often under the name "speaker twist connector".
Speaker wire is used to make the electrical connection between loudspeakers and audio amplifiers. Modern speaker wire consists of two or more electrical conductors individually insulated by plastic (such as PVC , PE or Teflon ) or, less commonly, rubber .
Another type of cassette adapter is the Bluetooth cassette adapter. It has the shape of a standard cassette, but has a built-in audio Bluetooth receiver module, a simple power supply to allow charging and power and a small battery. Usually, they may power on when the cassette player is set on play, and power off when the cassette player is stopped.
James Knox Polk (/ p oʊ k /; [1] November 2, 1795 – June 15, 1849) was the 11th president of the United States, serving from 1845 to 1849.A protégé of Andrew Jackson and a member of the Democratic Party, he was an advocate of Jacksonian democracy and extending the territory of the United States.
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