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Message: <blockquote data-quote="Trixter" data-source="post: 3050201" data-attributes="member: 542668">first off, when finding port displacement, you need to account for the material the port is made of and the air space it takes up. however, if your using 3/4" mdf for your box, then you can subtract 3/4" from the length...this is only for finding it's displacement. since you use the internal volume of the box, the thickness of the wood is already accounted for.secondly, the port must stay at least the port's width away from the back of the box.third, why don't you put the ports on top?fourth, if you use pvc, use the pvc 90deg. elbows (remember to measure down the center for port length). a single 4" port will need to be 15.75" long to tune a 2cu' box to 30hz...this is 2cu' net...after all displacement is accounted for...you may be better off going this route.</blockquote>

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