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<blockquote data-quote="Immacomputer" data-source="post: 3463193" data-attributes="member: 570419">Well, you can calculate it using limits but the only way to measure it would be to measure the Qts and Fs while it is in the setup.You can calculate the box volume but it actually approaches infinity. You can see it by this equation solved for Vb:<img src="http://i6.tinypic.com/67no8x3.png" alt="" class="fr-fic fr-dii fr-draggable " style="" />If you take the limit as Qtc approaches Qts, you will see that the squared quantity comes closer and closer to 1. As it approaches 1, Vas is divided by an increasingly small number. This sends Vb to infinity. Thus, the limit of the box volume (Vb) as Qtc --&amp;gt; Qts equals infinity. So basically, you can never really have any infinite baffle environment.In the second equation shown, you can see that as Qtc --&amp;gt; Qts, then the ratio of Qtc/Qts comes closer and closer to 1. That means that the resonance of the speaker in free-air (Fs) approaches the resonance of the enclosure/sub system. As we have already seen, as Qtc --&amp;gt; Qts, Vb goes to infinity so then Fc approaches Fs and as we can see from limits, Fc = Fs in a pure IB environment. To find out how close you are, you can plug and chug your numbers into those equations.A simpler way would be to use winisd alpha and keep changing the Vb until Qtc = Qts and the Fc = Fs. 10x vas is widely accepted because of how close that those numbers get to each other; basically it gets to the point where you&#039;re not really worried about it and the percentage off that you&#039;re going to be will probably be less than the tolerance of the materials used as well as power compression and the change of T/S parameters.</blockquote>

[QUOTE="Immacomputer, post: 3463193, member: 570419"] Well, you can calculate it using limits but the only way to measure it would be to measure the Qts and Fs while it is in the setup. You can calculate the box volume but it actually approaches infinity. You can see it by this equation solved for Vb: [IMG]http://i6.tinypic.com/67no8x3.png[/IMG] If you take the limit as Qtc approaches Qts, you will see that the squared quantity comes closer and closer to 1. As it approaches 1, Vas is divided by an increasingly small number. This sends Vb to infinity. Thus, the limit of the box volume (Vb) as Qtc --> Qts equals infinity. So basically, you can never really have any infinite baffle environment. In the second equation shown, you can see that as Qtc --> Qts, then the ratio of Qtc/Qts comes closer and closer to 1. That means that the resonance of the speaker in free-air (Fs) approaches the resonance of the enclosure/sub system. As we have already seen, as Qtc --> Qts, Vb goes to infinity so then Fc approaches Fs and as we can see from limits, Fc = Fs in a pure IB environment. To find out how close you are, you can plug and chug your numbers into those equations. A simpler way would be to use winisd alpha and keep changing the Vb until Qtc = Qts and the Fc = Fs. 10x vas is widely accepted because of how close that those numbers get to each other; basically it gets to the point where you're not really worried about it and the percentage off that you're going to be will probably be less than the tolerance of the materials used as well as power compression and the change of T/S parameters. [/QUOTE]

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