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Message: <blockquote data-quote="bbeljefe" data-source="post: 8295002" data-attributes="member: 655960"><p>Just to clarify, Sd is a measurement of the usable piston area (the part that actually moves) as opposed to the actual diameter of the driver. For a 15, that diameter is going to average 13.5", for an Sd of 143in². 176in² would be the total surface area of the driver but not the Sd we use in calculations.</p></blockquote><p></p>

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