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Curves vs 45's and kerfed ports
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<blockquote data-quote="PV Audio" data-source="post: 6549684" data-attributes="member: 554493"><p>Somebody has come with a lot of questions! //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</p><p></p><p>1. 45s are the cheap version. If you can use a curve, then use a curve. Sharp angles are air's worst friend. Some speaker builders even include sonotube sections in the rear of their enclosure so that the crosssection when looking from above looks like a wigwam. It helps to reduce the number of parallel walls and thus standing waves.</p><p></p><p>2. An angled port is not the same as a flared port. Contrary to the belief of 98% of the people on here, a kerf isn't really helping you all that much. The radius of the flare must be mathematically derived given the enclosure size and speaker. Opening gradually isn't enough; there are relationships that you need to use to get the most benefit.</p><p></p><p>3. Flared ports are only helpful if they're done on both ends. An aero has a flare on both ends. Flaring one end isn't the same and can't be called an aero, since aero is just a genericized trademark for a double flared port. Thus, if you want the full benefit, flare both inside and out.</p><p></p><p>4. Yes, the flare changes the tuning. Your port tuning without a flare is about 1.125 - 1.25 times more to have the same tuning as one with a port flare. For example, a 6" flared port will tune the same as a straight port between 6.125" and 6.25" with the same given length.</p></blockquote><p></p>
[QUOTE="PV Audio, post: 6549684, member: 554493"] Somebody has come with a lot of questions! [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] 1. 45s are the cheap version. If you can use a curve, then use a curve. Sharp angles are air's worst friend. Some speaker builders even include sonotube sections in the rear of their enclosure so that the crosssection when looking from above looks like a wigwam. It helps to reduce the number of parallel walls and thus standing waves. 2. An angled port is not the same as a flared port. Contrary to the belief of 98% of the people on here, a kerf isn't really helping you all that much. The radius of the flare must be mathematically derived given the enclosure size and speaker. Opening gradually isn't enough; there are relationships that you need to use to get the most benefit. 3. Flared ports are only helpful if they're done on both ends. An aero has a flare on both ends. Flaring one end isn't the same and can't be called an aero, since aero is just a genericized trademark for a double flared port. Thus, if you want the full benefit, flare both inside and out. 4. Yes, the flare changes the tuning. Your port tuning without a flare is about 1.125 - 1.25 times more to have the same tuning as one with a port flare. For example, a 6" flared port will tune the same as a straight port between 6.125" and 6.25" with the same given length. [/QUOTE]
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