BehringerMods FAQ - Floating Connections

To connect the inputs and outputs of the modified Behringer to single-ended equipment, the cables should be wired as illustrated below. XLR pin2 connects to the signal line of the RCA while XLR pin 1 & 3 connect to the ground of the RCA. To achieve best noise rejection, this should be done using balanced cable with XLR Pin 1 & 3 joined at the RCA end of the cable.