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Broadcast radio in the United States underwent a period of rapid change through the decade of the 1920s. Technology advances, better regulation, rapid consumer adoption, and the creation of broadcast networks transformed radio from a consumer curiosity into the mass media powerhouse that defined the Golden Age of Radio.
The early earphones used with wireless-era crystal sets had moving iron drivers that worked in a way similar to the horn loudspeakers of the period. Each earpiece contained a permanent magnet about which was a coil of wire which formed a second electromagnet .
The end of the experience crescendoed into the band being revealed and performing live over the headphones in a hidden ballroom. [28] [29] To promote the movie and album, the band screened the movie around the United States primarily at Alamo Draft House Cinemas [30] performing the score live over
KEF is a British company specialising in the design and production of a range of high-end audio products, including HiFi speakers, subwoofers, architecture speakers, wireless speakers, and headphones.
Listening devices of the East German security services. A covert listening device, more commonly known as a bug or a wire, is usually a combination of a miniature radio transmitter with a microphone. The use of bugs, called bugging, or wiretapping is a common technique in surveillance, espionage and police investigations.
A wireless microphone transmits the audio as a radio or optical signal rather than via a cable. It usually sends its signal using a small radio transmitter to a nearby receiver connected to the sound system, but it can also use infrared waves if the transmitter and receiver are within sight of each other.
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