Yeah skins, we can never underestimate the ability of our ears, or more specifically mind, to play tricks on us. Any permanent speaker break-in occurs in a matter of seconds, probably during testing at the factory.

Despite lack of hard evidence to support an audible change, this stuff continues to float around. Perhaps the wit who remarked that "Break-in was invented so that we couldn't return anything!" had it right.

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Enjoy the music, not the equipment.