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<blockquote data-quote="blue*thunder" data-source="post: 8827653" data-attributes="member: 687956">I'm attempting my first ported box~sonotube as it were.&nbsp; I made a sealed sonotube and it exceeded expectations&nbsp; but never being satisfied, it's time to see what more better, looks or sounds, like.I'm using an 8&quot; sub, 400w rms, the recommended (ported) box volume is .65-.70 cuft with a tuning frequency of 53hz.The tube volume I understand and factoring in available space, I can get .675 cuft per sub/tube.What I'm not totally convinced of. Is the round port required.&nbsp; Based on online calculators, I should use a port with 2&quot; inside diameter, 3&quot; long.Does that look right?I spoke with the sub tech and they didn't validate my findings, instead, suggest I use 12.75 sq in port.I then tried find calculator that would convert port physical dimensions to sq in internal area, and haven't had any luck or just not educated enough to know what I'm trying find.Figured I better find a car audio forum and see if I could get some help.Thanks</blockquote>

[QUOTE="blue*thunder, post: 8827653, member: 687956"] I'm attempting my first ported box~sonotube as it were. I made a sealed sonotube and it exceeded expectations but never being satisfied, it's time to see what more better, looks or sounds, like. I'm using an 8" sub, 400w rms, the recommended (ported) box volume is .65-.70 cuft with a tuning frequency of 53hz. The tube volume I understand and factoring in available space, I can get .675 cuft per sub/tube. What I'm not totally convinced of. Is the round port required. Based on online calculators, I should use a port with 2" inside diameter, 3" long. Does that look right? I spoke with the sub tech and they didn't validate my findings, instead, suggest I use 12.75 sq in port. I then tried find calculator that would convert port physical dimensions to sq in internal area, and haven't had any luck or just not educated enough to know what I'm trying find. Figured I better find a car audio forum and see if I could get some help. Thanks [/QUOTE]

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