I went to a flea market and bought some used cables. One of them was, I thought, XLR -> Stereo 1/4" male, a balanced cable. When I looked closer at it I saw that the 1/4" end was actually an adapter converting a male RCA to balanced 1/4" male. How can this be? What is this adapter for? As far as I know, you can't have a balanced RCA plug. Am I correct in thinking that, despite the XLR on one end, this is an unbalanced cable and that the adapter cannot rebalance an RCA plug? The only thing I can think is this adapter might work like a Y adapter, sending a mono signal to both left and right. I've never seen one of those before, usually you have to buy a Y cable.