Technically would a normal stereo RCA cables are working, in which you simply use only the red or the white plug. But as I had no ready so long stereo RCA cable and no dirt cheap wanted to order, when the then still a small risk of interference is at 10 meters distance there, I took the "HQ Digital Coaxial Cable". Something higher quality stereo RCA cables are namely not expensive or even more expensive.
The two plugs were properly into the sockets, the cable is coated thicker compared to cheap RCA cables, but without being too stiff. I could easily accommodate it together with a LAN cable into a cable duct from the hardware store, which has about 1cm x 1cm outside dimension.
