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<blockquote data-quote="audioholic" data-source="post: 7600562" data-attributes="member: 549629">I agree, but you also have to remember that mechanical limits are enclosure dependent. Just because you might reach mech limits before thermal in one enclosure or situation does not mean you always will. For example, SPL drivers that are designed to play at or near enclosure tuning will have their excursion minimized due to the damping force of the enclosure (but the enclosure&#039;s efficiency is at its peak, which is why SPL increases the closer you move towards enclosure tuning even though excursion decreases). So if you are building a driver that is intended to be placed in an SPL setup and burped in a vented enclosure that will work to keep excursion down, more BL force will help overcome this damping effect. So in such a situation thermal limits become as important, or in some cases more important, than mechanical limitations.Ideally, an SPL competitor will balance the enclosure damping with the wattage available to reach full xmax while staying just below thermal limits. of course, this is also time dependent, and the length of the burp would also affect this. This is why some seemingly small rule difference such as an average of output over a 30 second burp, versus a maximum SPL reading within a 30 second time period, will drastically affect how the competitor sets up his install.</blockquote>

[QUOTE="audioholic, post: 7600562, member: 549629"] I agree, but you also have to remember that mechanical limits are enclosure dependent. Just because you might reach mech limits before thermal in one enclosure or situation does not mean you always will. For example, SPL drivers that are designed to play at or near enclosure tuning will have their excursion minimized due to the damping force of the enclosure (but the enclosure's efficiency is at its peak, which is why SPL increases the closer you move towards enclosure tuning even though excursion decreases). So if you are building a driver that is intended to be placed in an SPL setup and burped in a vented enclosure that will work to keep excursion down, more BL force will help overcome this damping effect. So in such a situation thermal limits become as important, or in some cases more important, than mechanical limitations. Ideally, an SPL competitor will balance the enclosure damping with the wattage available to reach full xmax while staying just below thermal limits. of course, this is also time dependent, and the length of the burp would also affect this. This is why some seemingly small rule difference such as an average of output over a 30 second burp, versus a maximum SPL reading within a 30 second time period, will drastically affect how the competitor sets up his install. [/QUOTE]

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