XLR cables (External Line Return) are a type of electrical 3 pin connector typically found in professional audio, video and stage lighting equipment. They are the most important cables for live sound
XLR cables deliver balanced signals over long distances. A balanced signal means that the final audio signal will have less unwanted noise from outside electrical interference. This preserves the original audio signal, even over long distances, and ensures that the signal stays clear even when other electrical devices are present.
The most important quality of an XLR cable is that it is balanced enough that it is suitable for both live sound applications and recording studio applications. For example, if a mixing board is more than 25 feet away from the band that it is amplifying, XLR cables are used to balance the sound. In addition, XLR cables are used to connect most microphones and allow mixing boards to deliver phantom power (DC electrical power transmitted through cables) to handheld microphones