Burn in period

I’m surprised that I’ve never seen a video where someone puts a microphone in front of the speakers with new cables, measures the frequency response and then does it again when the cables are broken in. I’ve heard some pretty big changes after break in, which I would think would have to show up somewhere in the speaker output spectrum. Maybe everyone’s been measuring in the wrong place. As Amir is so fond of saying - we don’t stick the wire in our ear and listen. All that matters is what comes out of the speaker. 

No. Plain physics/electronics The signal is AC, so if there  was a dielectric change, it would be immediately degaussed.  The exception is if you have some DC offset.  If you do, you need to repair your equipment.  Different matter. 

There are cables that sustain an electric charge on the dielectric, but I don't think you are talking about that.

Now directionality.  The only way any cable can be directional is if there is a compensation network to match the side on the equipment in question.  Otherwise it sounds like you have taken salesmen or advertising seriously. Most of them do not get it, but they'll sell you a silver teflon special plug cable that makes you feel good.  For a while.

Burn in claimed time in hrs = return policy in hrs  ^ 2 + ( warranty * 3/7) 😂