We all know that you never evaluate a good high end designed speaker unless its burned in at least 200 to 500 hours so the crossover components can reach their maximum synergy of performance.
no such thing as burn in. If the tweeter is bright, the crossover DESIGN is what needs to be adjusted. It may be something as simple as reducing the highs by a couple db. It may be more complicated such as changing the slopes. But burn in will not fix the problem because its still the same crossover design and that is what needs adjusting.