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Message: <blockquote data-quote="audioholic" data-source="post: 4098811" data-attributes="member: 549629">'Tightness' is a product of the enclosure's alignment, not port area. The amount of port area will help dictate 1) air displacement potential of your system, and 2) velocity of the air as it travels through the port. Greater air speeds = more port noise/whistle.Round ports flow air more efficiently than do square/slot ports. For this reason you can get away with less port are using round ports than you can using square ports.You say you have a 7 inch port now.... what? 7" diameter (odd)? 3" round port? The answer is, going from 7" sq inches of round port area to 12 sq inches of square port area wont make much difference, if any.If you'd be more specific, we could answer your questions better. What exactly are you wanting to do, modify an existing box?</blockquote>

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