New home has built in speakers, but previous tenant and owner have no idea how to work them, please help!!

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.

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