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Message: <blockquote data-quote="IDSkoT" data-source="post: 5290460" data-attributes="member: 584344">When one side is smaller than the other, the air becomes turbulent as it rushes out of the port and makes a whistling sound. This is port noise... The rule of thumb is to keep the ratio at 9:1 in an attempt to prevent port noise. People also flare their ports in two different ways. Some just use a router and make the edges rounded over. Some use something called "kerfing" which is basically putting small cuts that don't go all the way through the wood at certain points to allow the wood to bend into a 90* degree angle, while making it rounded. This greatly reduces the chance of port noise.However, for an enclosure that small, I'd go with a round port. (AKA Aeroport) They require less space, and less design work.</blockquote>

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