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<blockquote data-quote="sackamous" data-source="post: 7128958" data-attributes="member: 609148"><p>Ok need a little clearing up here.</p><p></p><p>I know I need a box that is 7.5ft^3 after sub displacement tuned to 32htz. I run that through this formula LV= [(1.463 x 10^7 x R^2) / (Fb^2 x Vb)] - 1.463xR with a 100in^2 port and get a lenght of 26 and 13/16. That means my port will take up roughley 1.55ft^3 not counting the wood. That leaves me around 5.95ft^3 after takeing out the port. Do I just increase the box size to get back to the 7.5ft^3 (would this mess up the tune?) or to I need to start with a bigger box size before I do the port calculation to end up with the right volume and tune afterwords?</p></blockquote><p></p>
[QUOTE="sackamous, post: 7128958, member: 609148"] Ok need a little clearing up here. I know I need a box that is 7.5ft^3 after sub displacement tuned to 32htz. I run that through this formula LV= [(1.463 x 10^7 x R^2) / (Fb^2 x Vb)] - 1.463xR with a 100in^2 port and get a lenght of 26 and 13/16. That means my port will take up roughley 1.55ft^3 not counting the wood. That leaves me around 5.95ft^3 after takeing out the port. Do I just increase the box size to get back to the 7.5ft^3 (would this mess up the tune?) or to I need to start with a bigger box size before I do the port calculation to end up with the right volume and tune afterwords? [/QUOTE]
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