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Message: <blockquote data-quote="hispls" data-source="post: 8747547" data-attributes="member: 614752">You must first calculate the volume of air that port area = to your passive cone area would be then multiply that by the mass of air that would be contained in that port.... or just trial and error. For high power/high excursion you probably want to be more like double the active cone area in passive cone area.   Once tuned they theoretically behave just like a port except they're a lot of money and will require a lot of surface area on your box instead of large volume the a big port would eat up for you.Got a pair that someone DIY'd on a forum and I picked up cheap, never had an opportunity to do anything with them and they're up in the garage gathering dust.</blockquote>

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