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Message: <blockquote data-quote="n8skow" data-source="post: 8020809" data-attributes="member: 610656">Primarily? Cost...If neodymium slugs were as inexpensive as the more common strontium ferrite - we'd be seeing it used on all speakers...---------I'm not referring to how quickly the motor is moving (as that is dictated by frequency) - but with how much force it has 'to' change direction.Force is mass x acceleration, and there's give-and-take on both sides of the equation. Again - in comparison to a PA speaker, they use a fraction of the slug size found on most car audio woofers - instead utilizing a very light moving mass and comparatively tight magnetic gaps.</blockquote>

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