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High Quality Metal RCA Female to 3 PIN XLR Male Adaptor. This adaptor is designed to adapt a phone plug to an XLR input, XLR pin 3 is grounded resulting in an unbalanced signal. Connection A: 3-Pin XLR Male Plug ; Connection B: RCA Female Jack. XLR PIN-1 and 3 are tied together and carry the Ground via the Chassis, this connects to the Surround of the RCA.