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Message: <blockquote data-quote="IgnoreMe" data-source="post: 4126751" data-attributes="member: 551352">1) open win isd2) select new project3) the first driver that comes up, just press next, next, then select vented for the box type, next, forget the alignments, and press next. you should now get a graph and a little box pop uptip: you do not need to select the driver you are using to get port length. just select the first one it gives you4) select box and put in your volume, and tuning you are going to use5) select vents. there is a white circle there. if you are going to use a round port, leave it alone. if  you are going to use a slot port, click on the white circle6) change the vent diameter to the height and width you are going to usedo a 4^3ft box tuned to 35hz with 60^2 of port (15x4 in this case), and tell me what you got as port length.</blockquote>

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