Speaker cable solid and strand copper cable

Pure silver is the best. But for only 6 feet I doubt you will hear a difference 

fiesta75, thank you, I am trying to compensate one of my ear loss,  I think I will have to live with that ;)

fiesta75, Now, I can hear the singer breathing, but before, it was as if inside the loudspeaker the fluidity of the music was fighting, because of the bad connection of the loudspeaker and jumper wires. Now it's so much more alive, my moderately deaf ear is able to appreciate the music, there are so many details that stand out now. It really is another musical world.

Glad you’re happy. Pure silver is the best conductor but $$$

Solid core copper cables sound better to my ears than stranded copper cable.  This preference extends across multiple brands.