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<blockquote data-quote="audioholic" data-source="post: 7369096" data-attributes="member: 549629">Pretty much all of them that Ive looked into have relatively low BL. But Dan Wiggins, designer of XBL^2, says it doesn&#039;t have to, and I dont see how a second gap would necessarily lower BL otherwise. So I guess my answer is... maybe?Keep in mind that BL is a static spec, when in reality BL changes as the coil moves (yes, even in BL optimized subs, albeit less). So a sub that has a BL of 24, but remains consistent through out its excursion range, could be said to have &#039;more BL&#039; than a sub rated for a higher BL (say 30), but whose motor design means it loses it rapidly as the coil begins to leave the gap. Its like comparing two cars. One may have a HP rating of 300 hp, but you have to hit 7k rpm before it even comes close to that number, while another car/engine might be only rated for 270hp but displays that power along a wider range of RPM&#039;s. Which engine is more powerful? Really depends.</blockquote>

[QUOTE="audioholic, post: 7369096, member: 549629"] Pretty much all of them that Ive looked into have relatively low BL. But Dan Wiggins, designer of XBL^2, says it doesn't have to, and I dont see how a second gap would necessarily lower BL otherwise. So I guess my answer is... maybe? Keep in mind that BL is a static spec, when in reality BL changes as the coil moves (yes, even in BL optimized subs, albeit less). So a sub that has a BL of 24, but remains consistent through out its excursion range, could be said to have 'more BL' than a sub rated for a higher BL (say 30), but whose motor design means it loses it rapidly as the coil begins to leave the gap. Its like comparing two cars. One may have a HP rating of 300 hp, but you have to hit 7k rpm before it even comes close to that number, while another car/engine might be only rated for 270hp but displays that power along a wider range of RPM's. Which engine is more powerful? Really depends. [/QUOTE]

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