A cable with the proper impedance will transmit a less distorted binary (ON/OFF) waveform, but, so long as the receiver can still distinguish ON from OFF there will be no problem.
Component video, which also uses RCA plugs, is another story. Even for a short (3 ft) run I found that a cheap version of video cables having the proper impedance produced a better picture on a TV set than some audio interconnects that I had on hand. But this is an analog signal, where distortion matters.
Component video, which also uses RCA plugs, is another story. Even for a short (3 ft) run I found that a cheap version of video cables having the proper impedance produced a better picture on a TV set than some audio interconnects that I had on hand. But this is an analog signal, where distortion matters.