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Yes. As previously stated, the glues that manufatures all use to hold together vital parts of the motor assymbly will often have mini bubbles stired up in the glue. If you run the **** out of a speaker right out of the box, you run the risk of these air pockets expanding rapidly all at once. If this happens, it comprimises the close tolerances inside the motor assymbly, especially at the voice coil. Then the glue loses integrity, and parts start rubbing together that arent supposed to rub together.
I've seen kids blow their subs time and time again because they dont let them properly break in. Besides, it doesn't hurt anything by doing a break-in, so even if the manufactures and installers who recommend it are wrong, nothing is lost!
It's all about operating temperatures inside the motor assymbly. It has nothing to do with cycles per second!
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