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<blockquote data-quote="BOOMINGRANDPA" data-source="post: 8607303" data-attributes="member: 671921"><p>idk if it's 3x 4" port is more than 4" sq.. round starts at 7" slotted starts at 12" per cf of net air space., prefab i have has under 12sq in per cf sounds great but u can mess up sub playing like to that too long and most cases it kills sub output.. idk y round can be smaller other than the less port the air touches the better., as in if u had 1" w x 20" high port it would be better to do 3x6.5" because air wouldn't "touch" as much of the sides of port.. i'm sure others can say it better.. u don't want to small port but also don't want to much i think i'd been better off with .25" less width on mine (box in avatar)</p></blockquote><p></p>
[QUOTE="BOOMINGRANDPA, post: 8607303, member: 671921"] idk if it's 3x 4" port is more than 4" sq.. round starts at 7" slotted starts at 12" per cf of net air space., prefab i have has under 12sq in per cf sounds great but u can mess up sub playing like to that too long and most cases it kills sub output.. idk y round can be smaller other than the less port the air touches the better., as in if u had 1" w x 20" high port it would be better to do 3x6.5" because air wouldn't "touch" as much of the sides of port.. i'm sure others can say it better.. u don't want to small port but also don't want to much i think i'd been better off with .25" less width on mine (box in avatar) [/QUOTE]
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