Do speaker cables need a burn in period?

No, they don't.  Most burn in requirements are simply there to get you to keep the product beyond the return period.

@jl35  Bingo!! 🧐       @mitch2  @jnorris2005   Not so much.😔

all the new cables I have purchased came with a 30 day return period, and since burn in takes only a week or two, that was never an issue...and all the manufacturers said they would allow more time if needed...

I question whether it's the new cable that's burning in or is it the listener getting used to them?

Here we go again.....