Discrete components like Resistors, Capacitors and Semiconductors definitely need burn in. And Burn-in in the electronics industry is done to isolate and identify failures, as most defective components will fail within the first 24 hours. However Copper does not! Copper is a natural element, and it’s physical and electronic characteristics don’t change, simply because you pass current through it. All speaker cables do is move electrons from one atom to another when there is a difference of potential (voltage) applied. There is NOTHING to burn in, PERIOD! BTW, I have an education in Electronics and 40 years in the Audio Industry. This false theory is nothing more than Marketing Mumbo Jumbo created by Dishonorable people to sell crap (Overkill Speaker Cables) to unsuspecting, uneducated victims!