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<blockquote data-quote="SpeedEuphoria" data-source="post: 6973551" data-attributes="member: 623992">The box is 28&quot; wide so the 25.25&quot; front + 2&quot;port width +the side .75&quot;= 28&quot;on the port wall 10.75&quot; for the length is equal to the cut sheet 10&quot; + the .75&quot; for the front sheetanyway the port displacement I get is also .644cubes. The internal volume total is 2.484375 -.644=1.84 cubes like you say before sub displacement and the higher tuning you say.Anyway I think the OP is trying to build the box that it says on the Polk website. Pretty sure by comparing that you need to use 7.25&quot; in RE calculator for the &quot;square port length&quot; as this 7.25&quot; + the 10.75&quot;=18&quot; of port length which raises the box volume to near what it says on the polk website after displacement.But the tuning will be higher like ~37-38hz or so as they are shallow subs but couldnt find displacement info in there pdf.</blockquote>

[QUOTE="SpeedEuphoria, post: 6973551, member: 623992"] The box is 28" wide so the 25.25" front + 2"port width +the side .75"= 28" on the port wall 10.75" for the length is equal to the cut sheet 10" + the .75" for the front sheet anyway the port displacement I get is also .644cubes. The internal volume total is 2.484375 -.644=1.84 cubes like you say before sub displacement and the higher tuning you say. Anyway I think the OP is trying to build the box that it says on the Polk website. Pretty sure by comparing that you need to use 7.25" in RE calculator for the "square port length" as this 7.25" + the 10.75"=18" of port length which raises the box volume to near what it says on the polk website after displacement. But the tuning will be higher like ~37-38hz or so as they are shallow subs but couldnt find displacement info in there pdf. [/QUOTE]

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