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Internal Volume and Port tunning+Area
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<blockquote data-quote="Doxquzme" data-source="post: 8866546" data-attributes="member: 689267"><p>Not sure what the confusion is.</p><p>Outside dimensions</p><p>42.00" × 18.00" × 20.65"</p><p>Wood is 3/4"</p><p>The internal volume (after woofer and port displacement is 5 cu feet</p><p>The tuning is at 33hz</p><p>The port opening needs to equal 100 inches any combination that equals that. 6.06" × 16.50" (=99.99) is based on the dimensions of the box designed.</p><p>37.26" is how long the port is. Measured from the center line of the p[ort front to back of the port.</p><p>Cut sheet is the rest:</p><table style='width: 100%'><tr><td></td><td></td><td></td></tr></table> <table style='width: 100%'><tr><td>Top / Bottom</td><td>42.00" × 20.65"</td><td>2</td></tr></table> <table style='width: 100%'><tr><td>Front</td><td>35.19" × 16.50"</td><td>1</td></tr></table> <table style='width: 100%'><tr><td>Rear</td><td>42.00" × 16.50"</td><td>1</td></tr></table> <table style='width: 100%'><tr><td>Left</td><td>19.15" × 16.50"</td><td>1</td></tr></table> <table style='width: 100%'><tr><td>Right</td><td>19.90" × 16.50"</td><td>1</td></tr></table> <table style='width: 100%'><tr><td>Port</td><td>13.09" × 16.50"</td><td>1</td></tr></table> <table style='width: 100%'><tr><td>Port</td><td>16.61" × 16.50"</td><td>1</td></tr></table><p></p><p>the program doesn't understand that someone has to actually cut those measurements. What you need to concentrate on is this.</p><p></p><p>The external volume is 9 cubic feet, the gross internal volume (before the port and the subs) is 7.4 cubic feet. , the internal volume after the port (total port displacement is 2.15 cubic feet or 3726 cubic inches.) and the subwoofer displacement is 5 cubic feet - maintain this in any shape you can make fit in the area that the sub will go.</p><p></p><p></p><p>You just need to make the box according to that formula.</p><p>Internal prior to deducting the port is 7.4, the area that the port takes up is 2.15 cubic feet and the minus the sub displacement, equals the 5 cu ft.</p></blockquote><p></p>
[QUOTE="Doxquzme, post: 8866546, member: 689267"] Not sure what the confusion is. Outside dimensions 42.00" × 18.00" × 20.65" Wood is 3/4" The internal volume (after woofer and port displacement is 5 cu feet The tuning is at 33hz The port opening needs to equal 100 inches any combination that equals that. 6.06" × 16.50" (=99.99) is based on the dimensions of the box designed. 37.26" is how long the port is. Measured from the center line of the p[ort front to back of the port. Cut sheet is the rest: [TABLE] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [/TR] [/TABLE] [TABLE] [TR] [TD]Top / Bottom[/TD] [TD]42.00" × 20.65"[/TD] [TD]2[/TD] [/TR] [/TABLE] [TABLE] [TR] [TD]Front[/TD] [TD]35.19" × 16.50"[/TD] [TD]1[/TD] [/TR] [/TABLE] [TABLE] [TR] [TD]Rear[/TD] [TD]42.00" × 16.50"[/TD] [TD]1[/TD] [/TR] [/TABLE] [TABLE] [TR] [TD]Left[/TD] [TD]19.15" × 16.50"[/TD] [TD]1[/TD] [/TR] [/TABLE] [TABLE] [TR] [TD]Right[/TD] [TD]19.90" × 16.50"[/TD] [TD]1[/TD] [/TR] [/TABLE] [TABLE] [TR] [TD]Port[/TD] [TD]13.09" × 16.50"[/TD] [TD]1[/TD] [/TR] [/TABLE] [TABLE] [TR] [TD]Port[/TD] [TD]16.61" × 16.50"[/TD] [TD]1[/TD] [/TR] [/TABLE] the program doesn't understand that someone has to actually cut those measurements. What you need to concentrate on is this. The external volume is 9 cubic feet, the gross internal volume (before the port and the subs) is 7.4 cubic feet. , the internal volume after the port (total port displacement is 2.15 cubic feet or 3726 cubic inches.) and the subwoofer displacement is 5 cubic feet - maintain this in any shape you can make fit in the area that the sub will go. You just need to make the box according to that formula. Internal prior to deducting the port is 7.4, the area that the port takes up is 2.15 cubic feet and the minus the sub displacement, equals the 5 cu ft. [/QUOTE]
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