Most standard XLR female to RCA adapter cables have the XLR pin 3 connected to pin 1. Using an adapter like that can damage some components with electronically balanced outputs that are not designed to drive an impedance of 0 ohms. Those components will work properly with pin 3 disconnected. However, components with transformer coupled balanced outputs will not work with pin 3 disconnected, so connecting pin 3 to pin 1, either directly or through a load resistor is required. To provide compatibility with all components, Wireword XLR female to RCA adapter cables use 10K ohm resistors to connect pin 3 to pin 1. Please note that RCA to XLR male (RCA→XLR) adapter cables always require XLR pin 3 to be connected to pin 1.
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