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<blockquote data-quote="ciaonzo" data-source="post: 6157920" data-attributes="member: 607015">A driver&#039;s suspension has a certain springyness (not a real word) that is equivalent to a certain volume of air. You could blow up a balloon to represent that volume of air and feel the springyness of it. A sealed enclosure will have it&#039;s own springyness based on it&#039;s volume of air and it will act upon the driver&#039;s springyness in different ways based on how large that volume of air is relative to the driver&#039;s Vas. You can vary the enclosure size to act upon the drivers Qts and change the Qtc of the system (sub and enclosure working together). If you make the enclosure smaller than Vas you will drive the Qtc upward, maybe too high, and you will have peaky bass. If you make the enclosure larger than Vas the driver will be operating in a free-air fashion and the Qts of the driver will dominate. Qtc can never be less than the Qts of the driver so it only does so much to make the enclosure larger before it does no good at all. You can look at the Vas and Qts figure for the driver to get ballpark idea of what the enclosure volume might be.This isn&#039;t everything, it&#039;s just a simple version.</blockquote>

[QUOTE="ciaonzo, post: 6157920, member: 607015"] A driver's suspension has a certain springyness (not a real word) that is equivalent to a certain volume of air. You could blow up a balloon to represent that volume of air and feel the springyness of it. A sealed enclosure will have it's own springyness based on it's volume of air and it will act upon the driver's springyness in different ways based on how large that volume of air is relative to the driver's Vas. You can vary the enclosure size to act upon the drivers Qts and change the Qtc of the system (sub and enclosure working together). If you make the enclosure smaller than Vas you will drive the Qtc upward, maybe too high, and you will have peaky bass. If you make the enclosure larger than Vas the driver will be operating in a free-air fashion and the Qts of the driver will dominate. Qtc can never be less than the Qts of the driver so it only does so much to make the enclosure larger before it does no good at all. You can look at the Vas and Qts figure for the driver to get ballpark idea of what the enclosure volume might be. This isn't everything, it's just a simple version. [/QUOTE]

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