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Message: <blockquote data-quote="Trixter" data-source="post: 471900" data-attributes="member: 542668">I use different formulas to find different aspects of building boxes. There are so many calculators and they all produce different numbers. I figure this way is the most accurate. It make take a few minutes longer, but it's worth the piece of mind.Your 4" round port has more port area than a 2" x 4" slot port. The more port area you have, the longer you need to make the port to provide the same amonut of wind resistance. The amount of wind resistance is what tunes the box.Take a small coffee straw about 1" and blow through it. No take a big McDonalds straw about 1" long and blow through it; it's a lot easier. Now how long do you have to make the larger straw to be as hard to blow through as the coffee straw? Same thing here.</blockquote>

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