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<blockquote data-quote="ebrunn" data-source="post: 3177440" data-attributes="member: 572167">I am trying to design a box for a friend that has 2 15&quot; Power Acoustik Fubar&#039;s.&nbsp; The specs on them are that it needs a ported box at around 3 cu.ft and I was going to tune it for around 34hz. I read the tutorial on the top on this section about doing it with WinISD and so thats what I did.For net volume I used: 6.0 cu.ftPort area: 3 inches wide by 15 inches highTunning:34hzMy max dimensions were: 40 inches wide and 16.5 inches highProduct of remaining two sides:660Using WinISD I got a Port Length of: 10.55 inchesI used that to figure out my port displacement:((3+.75)*15*10.55) / 1728 = 0.34Then I came up with my gross volume:Net Volume(6.0)+Port Displacement(0.34)+Sub Displacement(.123)=6.157Then I solved for my remaining side:S= (6.157 * 1728) / 660 =16.120 inchesSo we got:Internal Dimensions:40 inches wide x 16.120 deep x 16.5 inches highNet Volume:6.0Port Area:3 inches x15 inchesPort Length:10.55Am I doing good so far?This is my first time using this way to do it.&nbsp; I usally use the calculator on Subwoofertools.com.Thanks in advance for any help.</blockquote>

[QUOTE="ebrunn, post: 3177440, member: 572167"] I am trying to design a box for a friend that has 2 15" Power Acoustik Fubar's. The specs on them are that it needs a ported box at around 3 cu.ft and I was going to tune it for around 34hz. I read the tutorial on the top on this section about doing it with WinISD and so thats what I did. For net volume I used: 6.0 cu.ft Port area: 3 inches wide by 15 inches high Tunning:34hz My max dimensions were: 40 inches wide and 16.5 inches high Product of remaining two sides:660 Using WinISD I got a Port Length of: 10.55 inches I used that to figure out my port displacement: ((3+.75)*15*10.55) / 1728 = 0.34 Then I came up with my gross volume: Net Volume(6.0)+Port Displacement(0.34)+Sub Displacement(.123)=6.157 Then I solved for my remaining side: S= (6.157 * 1728) / 660 =16.120 inches So we got: Internal Dimensions: 40 inches wide x 16.120 deep x 16.5 inches high Net Volume: 6.0 Port Area: 3 inches x15 inches Port Length: 10.55 Am I doing good so far? This is my first time using this way to do it. I usally use the calculator on Subwoofertools.com. Thanks in advance for any help. [/QUOTE]

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