I could hear 10K fine but not 18K so I loaded them both into my DAW to double check the levels. The levels were the same but in the DAW I could hear 18K fairly easily. Same computer and monitors. Strange.
They look like splitters and adapters to me.
I like the quote" I'M NOT SURE WHAT EXACTLY THEY ARE FOR AND WHAT THEY DO, BUT THEY ARE IN GREAT WORKING CONDITION. "