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Port Calc Sites (inconsistencies)
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<blockquote data-quote="robert J" data-source="post: 8632320" data-attributes="member: 674756"><p>I am confused by some port calc sites I have been researching.</p><p></p><p>in this</p><p></p><p>[MEDIA=youtube]ZqQyqs_UF8Q[/MEDIA] from CarAudioFabrication, he builds a box with gross volume of 3.5cf, net Vb 2.75cf tuned to 32Hz. The port size is 3.75x29.xxx inches.</p><p><img src="https://s17.postimg.org/j2ty87mfj/portquestion.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>When I do the same 2.75cf net volume port calc on <a href="https://www.the12volt.com/caraudio/boxcalcs.asp#rec" target="_blank">the12volt.com</a> their calc says the box needs a 42.5" port to tune to 32Hz. That is a 12" difference.</p><p></p><p>Can someone give me a link to a reliable calc site please or tell me where I am going wrong?</p><p></p><p>Cheers.</p><p></p><p><strong><span style="color: red">EDIT: I think I may see my problem. I should have used the gross volume of 3.5cf in the port calculation and not the net volume? If I do that, the port size is within a couple inches. </span></strong></p><p></p><p>Should not the tune calc be done with the net volume after port volume and driver displacement?</p></blockquote><p></p>
[QUOTE="robert J, post: 8632320, member: 674756"] I am confused by some port calc sites I have been researching. in this [MEDIA=youtube]ZqQyqs_UF8Q[/MEDIA] from CarAudioFabrication, he builds a box with gross volume of 3.5cf, net Vb 2.75cf tuned to 32Hz. The port size is 3.75x29.xxx inches. [IMG]https://s17.postimg.org/j2ty87mfj/portquestion.jpg[/IMG] When I do the same 2.75cf net volume port calc on [URL="https://www.the12volt.com/caraudio/boxcalcs.asp#rec"]the12volt.com[/URL] their calc says the box needs a 42.5" port to tune to 32Hz. That is a 12" difference. Can someone give me a link to a reliable calc site please or tell me where I am going wrong? Cheers. [B][COLOR=red]EDIT: I think I may see my problem. I should have used the gross volume of 3.5cf in the port calculation and not the net volume? If I do that, the port size is within a couple inches. [/COLOR][/B] Should not the tune calc be done with the net volume after port volume and driver displacement? [/QUOTE]
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