Quote Originally Posted by homme_de_terre View Post
Just connect the return signal (pin 3) to ground (pin 1)

Manfred
Although Europe has always configured an XLR-3 with pin 2 hot and pin 3 cold, US audio products were mixed. Older Altec electronics were pin 3 hot. In the big picture this is not an issue because it will not physically hurt anything. However, grounding pin 3 on a pin 3 hot circuit will invert the phase and there are audiophiles among you that may not be able to sleep knowing the phase is reversed. I simply think it is a good idea to check the data sheet for the "hot" pin and ground the "cold" pin when connecting RCAs to balanced inputs.