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<blockquote data-quote="Immacomputer" data-source="post: 2921075" data-attributes="member: 570419">Tuning the line to the Fs of the driver is not completely accurate for all drivers. You really need to calculate the line length based on the amount of air in the line itself. The sub will still see the air in the line and its resonant frequency will be higher than it&#039;s Fs unless the total amount of air is very large (lower Q drivers will have this happen often which is why people often say to use low Q drivers).To find the real resonant frequency of the driver, use the total amount of air in the line and model the sub in a sealed enclosure with the same amount of airspace and then find the resonant frequency. You can use Winisd Alpha to do this if you want to save some time and effort.From that point, you probably want to make the line slightly shorter and add stuffing until you get the desired response and impedance curve. Stuffing the line will change the speed of sound which will also change the apparent line length.These are all things to consider when creating transmission line enclosures.</blockquote>

[QUOTE="Immacomputer, post: 2921075, member: 570419"] Tuning the line to the Fs of the driver is not completely accurate for all drivers. You really need to calculate the line length based on the amount of air in the line itself. The sub will still see the air in the line and its resonant frequency will be higher than it's Fs unless the total amount of air is very large (lower Q drivers will have this happen often which is why people often say to use low Q drivers). To find the real resonant frequency of the driver, use the total amount of air in the line and model the sub in a sealed enclosure with the same amount of airspace and then find the resonant frequency. You can use Winisd Alpha to do this if you want to save some time and effort. From that point, you probably want to make the line slightly shorter and add stuffing until you get the desired response and impedance curve. Stuffing the line will change the speed of sound which will also change the apparent line length. These are all things to consider when creating transmission line enclosures. [/QUOTE]

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