a beginner question about compatibility of cable metals for speakers (s video)

hello,

I have little technical knowhow.

But I understood the purer the metal material in the cable for speakers, the better the audio will go through, and the thicker the (amount of metal) in the cable, the better the audio will go through. Am I right?

I have a 120watt hifi (panasonic, new, middle-range quality sc-pmx100) to which i want to connect a pair of (in my assumption) much higher quality pair of old speakers (with double wiring input, by the way) Elac brand - made in germany - middle sized speakers.

I am located now in a rural area, and found brand new silver s-video cables never opened. Could I use this s-video cable for the speakers instead of the standard copper delivered audio speakers? (offcourse cutting the connections and just using the two wires as plus and minus).

Would I make any damage to speaker or amplifier? Would I get improved sound quality doing that?

Thanks for your thoughts.