XLR Female to RCA Male. This adaptor is designed to adapt an XLR3M to a phono input. XLR pin 3 is grounded resulting in an unbalanced signal. XLR PIN-2 goes to the center contact of the RCA, this carries the signal. XLR PINs-1 and 3 are tied together andcarry the Ground via the Chassis. This connects to the Surround of the RCA.