Generally for me they sound bright first,but some electronics I remember my Thor Audio Electronics had actually 3 different phases of burn in ...From bright to dark and then to perfect.......I would assume it could go either way..
Burn in question and evaluation before burn in
We all experienced sound transformation before and after a new equipment or cable is burned in, however, I am wondering if there is a general rule as to which direction any burn in would be heading? Specifically, I am interested to know would sound generally go smoother/darker or brighter/more transparent after burn in? I am thinking if there is such a rule, it would be valuable to know for evaluating products.