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<blockquote data-quote="mud" data-source="post: 369088" data-attributes="member: 550416">I&#039;m building a new box for my MTX T8124A, and I think I have a good design, but I have a few questions.First, as you can see in the pictures, my box is going to be a trapezoid-type shape.&nbsp; Will this screw up the port, or can I figure out tuning by doing (area) x (top lenth + bottom length)?&nbsp; If this works, I come up with a net volume of ~ 2.1 ft^3 for box, 27 in^2 port area, 33.5 in port lenth, with a tuning freq of ~28 Hz.&nbsp; Does this look right?Second, WinISD tells me the port should be 33.5&quot; long for a tuning freq of 27.8 Hz, BCAE tells me the port should be 26.3&quot; long for the same tuning freq.&nbsp; Which one is more accurate?Thanks, Orion<img src="http://img17.photobucket.com/albums/v51/orionb/box-profile.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://img17.photobucket.com/albums/v51/orionb/Box-Top.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://img17.photobucket.com/albums/v51/orionb/Box-Side.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://img17.photobucket.com/albums/v51/orionb/Box-Front.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

[QUOTE="mud, post: 369088, member: 550416"] I'm building a new box for my MTX T8124A, and I think I have a good design, but I have a few questions. First, as you can see in the pictures, my box is going to be a trapezoid-type shape. Will this screw up the port, or can I figure out tuning by doing (area) x (top lenth + bottom length)? If this works, I come up with a net volume of ~ 2.1 ft^3 for box, 27 in^2 port area, 33.5 in port lenth, with a tuning freq of ~28 Hz. Does this look right? Second, WinISD tells me the port should be 33.5" long for a tuning freq of 27.8 Hz, BCAE tells me the port should be 26.3" long for the same tuning freq. Which one is more accurate? Thanks, Orion [IMG]http://img17.photobucket.com/albums/v51/orionb/box-profile.gif[/IMG] [IMG]http://img17.photobucket.com/albums/v51/orionb/Box-Top.gif[/IMG] [IMG]http://img17.photobucket.com/albums/v51/orionb/Box-Side.gif[/IMG] [IMG]http://img17.photobucket.com/albums/v51/orionb/Box-Front.gif[/IMG] [/QUOTE]

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