Can't really know which is which because of the fact we don't know which colors are on the other end, and if I've learned one thing about previous owners of a house: They will do weird things. I had a previous owner bootleg ground every lightswitch on one floor in a previous home and I had to rewire them. The worst part? They did not color code with the "standard" and it was dangerous. This is different with speakers and I cannot recall what would damage speakers, but I personally wold guess the Red either goes with the green and the white with the black but I don't know. With those knobs on the wall, you have to turn them up some after you have everything hooked up and the volume on your amp up too.