Do speaker cables need a burn in period?

One thing is for sure. If the 10 meter inductor copper wire were controlled for directionality the speaker would sound better, dammit. And it wouldn’t cost anything. Think about it. 😳

I've learned that nothing and absolutely nothing is free.  The costliest thing is beauty and worth every penny,

smitchem1 pretty much hit the nail right on the head as to why the "wire is wire" people (new batch / where did they all come from?) can't hear any difference with this: "They had an electrical engineer explain". Enough said. 

The costliest thing is knowledge. Beauty is all around us. It’s free. Just like controlling directionality. For a fuse, you just try it both ways. 

Sure they do.  I PERSONALLY have spoken to the electrons and they MUCH PREFER cables that have been broken in so they can travel in smoother lines.