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<blockquote data-quote="mendon mafia" data-source="post: 6544393" data-attributes="member: 584590">Which one is the best.carstereo, RE, and 12volt all yeild the exact same results. 3 cubes net 48&quot; area yeild 31.5&quot; length for a regular port. Is there another calc thats better?carstereo has a feature to account for a slot port.&nbsp; Yields 29.5 length for the above box parameters.Is the calc on carstereo accurate when accounting for a slot port?&nbsp; Is this why the RE calc is said to be way off, since it only allows you to design a slot port but they dont shorten the port accordingly.IIRC for a slot you can extend the effective length of the vent half the width of the port longer that the actual length, on both sides. IE for a 4&quot; wide port you would add 4&quot; in length (2&quot; on for each opening)Please correct me if im wrong.Now for a kerned port how do you determine the length? IIRC its half the length of the flared section.Again please correct me if in wrong.</blockquote>

[QUOTE="mendon mafia, post: 6544393, member: 584590"] Which one is the best. carstereo, RE, and 12volt all yeild the exact same results. 3 cubes net 48" area yeild 31.5" length for a regular port. Is there another calc thats better? carstereo has a feature to account for a slot port. Yields 29.5 length for the above box parameters. Is the calc on carstereo accurate when accounting for a slot port? Is this why the RE calc is said to be way off, since it only allows you to design a slot port but they dont shorten the port accordingly. IIRC for a slot you can extend the effective length of the vent half the width of the port longer that the actual length, on both sides. IE for a 4" wide port you would add 4" in length (2" on for each opening) Please correct me if im wrong. Now for a kerned port how do you determine the length? IIRC its half the length of the flared section. Again please correct me if in wrong. [/QUOTE]

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