On the back of an audio output device, I see a pair of female RCA connectors. Next to them are, in a single green plastic block, two sets of three pins. I am guessing (and I am only guessing) these are balanced-line outputs. But my Google-fu cannot find anything that looks like them, much less like it would connect with them. To the best of my graphic-arts abilities, here's (something akin to) what it looks like: Does anyone know what this thing is called?