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<blockquote data-quote="T3mpest" data-source="post: 3966968" data-attributes="member: 560148">Wow, old thread, but I&#039;ll answer anyway.&nbsp; Xmax is lower for SPl subs in general because Xmax measures linear excursion.&nbsp; That&#039;s essentially how far a sub can move while still accuractly reproducing the signal sent to it (sq). (it&#039;s also where bl drops below 70% of resting value)A SPl sub doesn&#039;t worry about clean excursion.&nbsp; It might only have an xmax of 4mm, past that all the excursion is non-linear.&nbsp; However, since all we are doing is trying to move air, we don&#039;t care if it accurate or not.&nbsp; You&#039;ll be more concerned about a stat like xmech or xsus.&nbsp; Those stats will tell you how far the sub can move period, regardless of whether the excursion is linear.&nbsp; A SPLsub might only have 12mm of clean excursion, but can move 60mm if you take into account it&#039;s non-linear travel.Secondly a SPL sub is usually used in ported boxes.&nbsp; When you play a note near the tuning frequency of a ported box, excursion is minimized.&nbsp; The port will be making most of the noise.&nbsp; Usually when you play notes near tuning it would take stupid amounts of powe for sub to run out of excursion, especially if its&#039; mechanical limits (xsus, not xmax) are like 60mm. You could need as much as 60,000 watts to make it move that far.&nbsp; That&#039;s why subs that are SPL oriented have high power handling ratings, they arent&#039; going to move very much near tuning unless they can handle ALOT of power.</blockquote>

[QUOTE="T3mpest, post: 3966968, member: 560148"] Wow, old thread, but I'll answer anyway. Xmax is lower for SPl subs in general because Xmax measures linear excursion. That's essentially how far a sub can move while still accuractly reproducing the signal sent to it (sq). (it's also where bl drops below 70% of resting value) A SPl sub doesn't worry about clean excursion. It might only have an xmax of 4mm, past that all the excursion is non-linear. However, since all we are doing is trying to move air, we don't care if it accurate or not. You'll be more concerned about a stat like xmech or xsus. Those stats will tell you how far the sub can move period, regardless of whether the excursion is linear. A SPLsub might only have 12mm of clean excursion, but can move 60mm if you take into account it's non-linear travel. Secondly a SPL sub is usually used in ported boxes. When you play a note near the tuning frequency of a ported box, excursion is minimized. The port will be making most of the noise. Usually when you play notes near tuning it would take stupid amounts of powe for sub to run out of excursion, especially if its' mechanical limits (xsus, not xmax) are like 60mm. You could need as much as 60,000 watts to make it move that far. That's why subs that are SPL oriented have high power handling ratings, they arent' going to move very much near tuning unless they can handle ALOT of power. [/QUOTE]

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