curioser and curioser.
Subs generally require a coaxial cable terminated with RCA connecters to attach to the receiver's LFE/sub output so, technically, neither of the wires are "correct".
But, if you can somehow correctly put RCA connectors onto both ends of one of them, it should pass sound.
I have no idea what this "audio adapter" or "impedance" or "static" you refer to is.
If push comes to shove, you can purchase an audio interconnect of suitable length with RCA plugs on the ends for a pittance and run it externally from the walls.