Lassig and jsec provided helpful PM guidance in understanding installation of structured wiring. Since I was pulling wire for computers, coax for TV's, and what-not, I also installed speaker wire for the potential of different speaker placement options. The subject boxes are nothing more than speaker wire terminations. Why so close to each other? Well, that's another little side story. I laid out all the framing, windows, and wiring to allow the potential of installing a wall and a couple of doors to split the newly developed zone into 2 separate rooms, ie; bedrooms. The wall would land directly between the 2 subject boxes, one in each room, and they would marry up witn the other boxes laid out within the opposing ends of the shop zone.