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XLR3 cable connectors female (left) and male. The XLR connector is a type of electrical connector primarily used in professional audio, video, and stage lighting equipment. XLR connectors are cylindrical, with three to seven connector pins, and are often employed for analog balanced audio interconnections, AES3 digital audio, portable intercom, DMX512 lighting control, and for low-voltage ...
Two pins are used for the mono headphone signal and two pins for the unbalanced microphone signal. The 4-pin XLR connector is also commonly used on amateur radio microphones, but transferring unbalanced audio instead, and using the 4th pin (with the common ground) for a push-to-talk (PTT) circuit activated by a button on the microphone.
The vast majority of audio multicore cables consist of a number of twisted-pair copper wires, suitable for balanced audio. [2]: 50 To reduce noise, the shield of each channel is often isolated from the other shields. Balanced connections may use XLR connectors or 1 ⁄ 4 inch (6.35 mm) TRS phone connectors (see § Terminations).
Balanced audio is a method of interconnecting audio equipment using balanced interfaces. This type of connection is very important in sound recording and production because it allows the use of long cables while reducing susceptibility to external noise caused by electromagnetic interference.
Among audio engineers, the connector may often simply be called a quarter-inch to distinguish it from XLR, another frequently-used audio connector. These naming variations are also used for the 3.5 mm connectors, which have been called mini-phone , mini-stereo , mini jack , etc.
The standard [29] colors for the various signals are shown in the table below; however, beyond 7.1 audio, the standard has degraded to a more general white/yellow, red/blue, and green/yellow color scheme for each cable respectively. Stereo audio applications use either black and red, grey and red, or white and red RCA connectors; in all three ...
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