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can somebody tell me how to figure out net cubes and port info on already built box
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<blockquote data-quote="Kangaroux" data-source="post: 8304959" data-attributes="member: 628495"><p>Your dimensions are 37 x 16 x 18</p><p></p><p>3/4" wood all around means subtract 2x that for either side from each dimension</p><p></p><p>35.5" x 14.5" x 16.5"</p><p></p><p>Multiply all the dimensions together and then divide by 1728 (12 * 12 * 12 = 1728 in^3)</p><p></p><p>= 8493.375 in^3 / 1728 = <strong>4.91 ft^3</strong></p><p></p><p>That's your gross volume (before port and subs).</p><p></p><p>Your port is 3" (+ 3/4") x 14.5" x 17.5"</p><p></p><p>= 951.56 in^3 / 1728 = <strong>0.55 ft^3</strong></p><p></p><p>Now subtract port displacement from the gross volume:</p><p></p><p>4.91 - 0.55 = 4.36 ft^3</p><p></p><p>And assume subs are 0.15 each:</p><p></p><p>4.36 - (0.15 * 2) = <strong>4.06 ft^3</strong></p><p></p><p>Then to calculate the port you use this calculator: <a href="http://www.the12volt.com/caraudio/boxcalcs.asp#porsq" target="_blank">Subwoofer Enclosure Calculators, Parallel, Series, Port Length and Volume</a></p><p></p><p>Enter in 3" and 14.5" for the port dimensions and 4.06 ft^3 for the volume. Keep adjusting the tuning until the port length matches what you have. In this case it's about 35-36 hz</p></blockquote><p></p>
[QUOTE="Kangaroux, post: 8304959, member: 628495"] Your dimensions are 37 x 16 x 18 3/4" wood all around means subtract 2x that for either side from each dimension 35.5" x 14.5" x 16.5" Multiply all the dimensions together and then divide by 1728 (12 * 12 * 12 = 1728 in^3) = 8493.375 in^3 / 1728 = [B]4.91 ft^3[/B] That's your gross volume (before port and subs). Your port is 3" (+ 3/4") x 14.5" x 17.5" = 951.56 in^3 / 1728 = [B]0.55 ft^3[/B] Now subtract port displacement from the gross volume: 4.91 - 0.55 = 4.36 ft^3 And assume subs are 0.15 each: 4.36 - (0.15 * 2) = [B]4.06 ft^3[/B] Then to calculate the port you use this calculator: [URL="http://www.the12volt.com/caraudio/boxcalcs.asp#porsq"]Subwoofer Enclosure Calculators, Parallel, Series, Port Length and Volume[/URL] Enter in 3" and 14.5" for the port dimensions and 4.06 ft^3 for the volume. Keep adjusting the tuning until the port length matches what you have. In this case it's about 35-36 hz [/QUOTE]
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can somebody tell me how to figure out net cubes and port info on already built box
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