I see quite a few people her mention burning-in of components. Speakers I get, the suspensions will loosen over time. But what about passive components like capacitors? Has there ever been any research (links please) showing a measurable change in performance of a capacitor or some other such component that changes after 100-200 hours of use? The brain is pretty amazing and will adjust to accommodate inadequacies in the reproduction chain. So I'm wondering what burns-in first, the component, or the brain? Thoughts?