Do speaker cables need a burn in period?

My experience with the "break/burn In" is mostly yes it does make a difference. The Magnepan speakers took about 2-3 months before they came alive. I have a recently rebuilt before purchasing, Carver M500t amp that took quite a while to acquire that Class A musical kinda tubey sound. My 1 year old ART9 cartridge is still breaking in after about 350 hours of use and now sounds marvelous. 

Not sure how many of the time-line markers in the link below are data driven, one guy’s O-pinion or from wider-based experience. I too think speaker cables, actually all audio wire (even power cords - a surprise to me) and components undergo "burn in". Whether you are happy with the sound "post-burn in" is a different issue. Even if your AQ cable was used, sonic changes might still occur during a "settling in" period. How much any of this is purely physical and objective vs psycho-acoustic and subjective seems moot to me. The experience remains.

https://www.mojo-audio.com/blog/breaking-in-cables-and-components/

A long time ago, I decided not to agonize over cable burn-in.  I had read post after post about cables sounding good, bad, bright, thin, dynamic, flat, and then finally, and magically (always after something like 500 hours), sounding great.  Some folks even too listening notes to document their cable burn-in process. Why would anyone want to go through all that and how can anyone be sure that the perceived changes are due to burn-in and not the psychoacoustical effect of familiarization?

My solution was to research burn-in devices and to purchase an Audiodharma Cable Cooker, which I use to condition/burn-in all my cables, both those I make and manufactured cables I purchase.  I recondition cables if I change connectors and after they have been sitting unused for awhile.  After conditioning a cable on the Cable Cooker I simply do not think about burn-in since I have better things to do.

Another way to facilitate burn in is to use a CD test/break in treatment like Ayre's Irrational but Efficacious CD Treatment. I can get impatient with break in and plopping the CD in and letting it run for an hour or two on repeat can greatly speed up the break in process.

Before and after can be a real eye & ear opener. After hearing the results, I now do it 2-3 times with playing CDs in between to any new component I get.

All the best,
Nonoise

Even if they're been used before, or cooked prior to shipping, they still need time to "settle" in the new system.