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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 8343947" data-attributes="member: 576029">what you have drawn will behave like a ported box.  you have a large chamber with a port.T-line needs to have the same cross-sectional area as the cone surface area (total).  if you do a chamber-coupled T-line the chamber should be as small as possible.Fs is 20.4Hz.  if you want to shoot for a line length that is 1/4 wavelength of that, it's 14 feet long.  not likely given your dimensional limitations.  at 30Hz the line length is 9.4 feet.length for 1/4 wavelength is just (1125/f)/41125 is the speed of sound in feet per secondf is the frequency of interestthe final division by 4 is just for 1/4.your best resource for T-Line design is the Loudspeaker Design Cookbook, 7th edition.</blockquote>

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