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<blockquote data-quote="Moe Lester" data-source="post: 1069600" data-attributes="member: 551478">the XXX&#039;s displacement is .21 cubes, the port is a MINIMUM of 26.5&quot; long. The real length depends on how he measured it. I doubt end correction was factored in, nor was it measured down the middle. So if the port is 13.5 high, and 2.75 wide, 3/4&quot; MDF. we can get a rough estimate that the port is 13.5 x 3.5 x 26.5 = .724 cubic feet..724 + .21 = .934 cubes.3 - .934 = 2.066a port 2.75 x 13.5 needs to be ~26.25&quot; long to achieve a tuning of 40hz for 2 cubes. However i believe that the port was measured on the inside walls, not down the center, nor was end correction added in. Its probably ~ 4&quot; longer measured down the center and with end correction factored in. That will reduce the box volume slightly, but the tuning is still going to drop.I cant give you an exact airspace/tuning because im not the one measuring it. Im sure he measured the box differently than I would have, so the best i can do is try to make a somewhat accurate guess.</blockquote>

[QUOTE="Moe Lester, post: 1069600, member: 551478"] the XXX's displacement is .21 cubes, the port is a MINIMUM of 26.5" long. The real length depends on how he measured it. I doubt end correction was factored in, nor was it measured down the middle. So if the port is 13.5 high, and 2.75 wide, 3/4" MDF. we can get a rough estimate that the port is 13.5 x 3.5 x 26.5 = .724 cubic feet. .724 + .21 = .934 cubes. 3 - .934 = 2.066 a port 2.75 x 13.5 needs to be ~26.25" long to achieve a tuning of 40hz for 2 cubes. However i believe that the port was measured on the inside walls, not down the center, nor was end correction added in. Its probably ~ 4" longer measured down the center and with end correction factored in. That will reduce the box volume slightly, but the tuning is still going to drop. I cant give you an exact airspace/tuning because im not the one measuring it. Im sure he measured the box differently than I would have, so the best i can do is try to make a somewhat accurate guess. [/QUOTE]

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