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<blockquote data-quote="rickmandick" data-source="post: 8265113" data-attributes="member: 660831">Yes Im using DD&#039;s calculations and and old trusty calculator. Ive used the specs before to build box&#039;s for my DD&#039;s before I quit. 7-8 years away and you get rusty. Before anyone asks about my math, I&#039;ll show you the basis for it..77 is the number recommended by DD for enclosures under 5 cubes to get gross internal. It really should be .75, but that falls under the 10%..82 is the number recommended by DD to include subwoofer, bracing and port displacement.These numbers do not appear &quot;magic&quot; at all. DD came up with them after running calculations for enclosure&#039;s under 5 cubes all while taking into account&nbsp; the average sub, bracing and port displacement.At this net size DD recommends, 64 sq of port and 19 inches in length for a tuning for 35-40hz.I&#039;ve used Torres and everything else the past few days. Not much help with DD&#039;s limited available T/s numbers and none seem to work for a L port.</blockquote>

[QUOTE="rickmandick, post: 8265113, member: 660831"] Yes Im using DD's calculations and and old trusty calculator. Ive used the specs before to build box's for my DD's before I quit. 7-8 years away and you get rusty. Before anyone asks about my math, I'll show you the basis for it. .77 is the number recommended by DD for enclosures under 5 cubes to get gross internal. It really should be .75, but that falls under the 10%. .82 is the number recommended by DD to include subwoofer, bracing and port displacement. These numbers do not appear "magic" at all. DD came up with them after running calculations for enclosure's under 5 cubes all while taking into account the average sub, bracing and port displacement. At this net size DD recommends, 64 sq of port and 19 inches in length for a tuning for 35-40hz. I've used Torres and everything else the past few days. Not much help with DD's limited available T/s numbers and none seem to work for a L port. [/QUOTE]

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