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<blockquote data-quote="Trixter" data-source="post: 334098" data-attributes="member: 542668">First you need a box that is 1.25cu&#039;...which it sounds like you have. But you need to account for driver and port displacement. The port displacement in a 4&quot; by 12&quot; round port is .09cu&#039;. Add that to you sub displacement and that is how big of a box you will need.EX: 1.25 + .09 + .1 (est. sub disp.) = 1.44cu&#039; this is want you need you total box size to be.If your box is 1.25 and cannot be changed then you subtract the sub disp. and ettimate a port disp.Lets try....1.25 - .1 (est. sub disp.) - .1 (est.port disp.) = 1.05cu&#039; enclosure. To tune this box to 40Hz and using a 4&quot; port it needs to be 17&quot; LThe sub disp. of .1 may be on the big side but as I said these are just estimates.If the specs call for 1.25cu&quot; with a 4&quot; port that is 12&quot; long, and you have a 1.25cu&#039; box already, simply put the port in that box. Manufactures account for the displacement when they give you dimensions. And by doing this you can take what I was saying above and toss it out the window because it may just confuse you.Hope this helps.</blockquote>

[QUOTE="Trixter, post: 334098, member: 542668"] First you need a box that is 1.25cu'...which it sounds like you have. But you need to account for driver and port displacement. The port displacement in a 4" by 12" round port is .09cu'. Add that to you sub displacement and that is how big of a box you will need. EX: 1.25 + .09 + .1 (est. sub disp.) = 1.44cu' this is want you need you total box size to be. If your box is 1.25 and cannot be changed then you subtract the sub disp. and ettimate a port disp. Lets try.... 1.25 - .1 (est. sub disp.) - .1 (est.port disp.) = 1.05cu' enclosure. To tune this box to 40Hz and using a 4" port it needs to be 17" L The sub disp. of .1 may be on the big side but as I said these are just estimates. If the specs call for 1.25cu" with a 4" port that is 12" long, and you have a 1.25cu' box already, simply put the port in that box. Manufactures account for the displacement when they give you dimensions. And by doing this you can take what I was saying above and toss it out the window because it may just confuse you. Hope this helps. [/QUOTE]

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