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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.
Staff set up sound system speaker cabinets for an outdoor event. Audio-visual rental systems have to be able to withstand heavy use and even abuse from renters. For this reason, rental companies tend to own speaker cabinets that are heavily braced and protected with steel corners, and electronic equipment such as power amplifiers or effects are ...
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Headphones appeared in the emerging field of wireless telegraphy, which was the beginning stage of radio broadcasting. Some early wireless telegraph developers chose to use the telephone receiver's speaker as the detector for the electrical signal of the wireless receiving circuit. [17]
The original 1 ⁄ 4-inch (6.35 mm) version descends from as early as 1877 in Boston when the first telephone switchboard was installed [9] or 1878, when an early switchboard was used for the first commercial manual telephone exchange [10] [11] in New Haven created by George W. Coy.
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When this resonance effect is combined with some sort of active feedback mechanism and power input, it is possible to set up an oscillation which can be used to generate periodic acoustic signals such as musical notes (e.g. in an organ pipe). The application of transmission line theory is however seldom used in acoustics. An equivalent four ...