Many cable manufacturers use the term "settling in." A new cable has been manufactured, then coiled into a package and now you are installing it in your system. I believe the settling in process has to do with introducing current into the cable and its interaction between the conductor and the dielectric (or insulation) on a molecular level.
There are so many different cable designs with different substances being used for dielectrics and many different types of metallurgy being used as conductors. The EE measuring parameters with a scope may see a consistent signal, but who’s to say definitively that there is no audible change in the cable after it’s "broken in."
There are so many different cable designs with different substances being used for dielectrics and many different types of metallurgy being used as conductors. The EE measuring parameters with a scope may see a consistent signal, but who’s to say definitively that there is no audible change in the cable after it’s "broken in."