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<blockquote data-quote="squeak9798" data-source="post: 801181" data-attributes="member: 555320">DEI and JBL both have dual gap technologies.&nbsp; But, where XBL^2 has the advantage is that it can be easily implimented into almost any driver, since it simply relies on &quot;ribs&quot; (or whatever you want to call them) being cut into the top plate and pole piece.&nbsp; The DEI and JBL versions of dual gap technologies actually use dual magnets, dual top plates, etc etc.&nbsp; As you can see, these are much more space prohibitive and not something easily implimented....especially into a small driver like a 4&quot; mid or tweeter.And as zebo said.....Dan has eluded many times to the fact that XBL^2 is out there in drivers that we don&#039;t know about (because they don&#039;t advertise it and because of non-disclosure contracts).&nbsp; Sure would be nice to know though //content.invisioncic.com/y282845/emoticons/up2something.gif.dd110ecf3ae4b76050d87598f2f8de7c.gifAnswer:Non-XBL^2 drivers can still sound excellent.&nbsp; Not to plug SS; but the TC2+ and TC9 are prime examples of that.&nbsp; Very nice &quot;standard&quot; design&quot; low distortion subs.&nbsp; I read a review where someone preferred the sound of their Rl-p over the sound of their Brahma.&nbsp; And mmray&#039;s review, where the SS Rl-p and XXX were basically hand-&amp;amp;-hand SQ wise.&nbsp; And the IDMax is another great example of an excellent SQL (excellent sound quality and impressive output), while not being XBL^2 enabled.So.....basically, don&#039;t discount a sub (or other driver) simply because it does not have XBL^2.</blockquote>

[QUOTE="squeak9798, post: 801181, member: 555320"] DEI and JBL both have dual gap technologies. But, where XBL^2 has the advantage is that it can be easily implimented into almost any driver, since it simply relies on "ribs" (or whatever you want to call them) being cut into the top plate and pole piece. The DEI and JBL versions of dual gap technologies actually use dual magnets, dual top plates, etc etc. As you can see, these are much more space prohibitive and not something easily implimented....especially into a small driver like a 4" mid or tweeter. And as zebo said.....Dan has eluded many times to the fact that XBL^2 is out there in drivers that we don't know about (because they don't advertise it and because of non-disclosure contracts). Sure would be nice to know though [IMG]//content.invisioncic.com/y282845/emoticons/up2something.gif.dd110ecf3ae4b76050d87598f2f8de7c.gif[/IMG] Answer: Non-XBL^2 drivers can still sound excellent. Not to plug SS; but the TC2+ and TC9 are prime examples of that. Very nice "standard" design" low distortion subs. I read a review where someone preferred the sound of their Rl-p over the sound of their Brahma. And mmray's review, where the SS Rl-p and XXX were basically hand-&-hand SQ wise. And the IDMax is another great example of an excellent SQL (excellent sound quality and impressive output), while not being XBL^2 enabled. So.....basically, don't discount a sub (or other driver) [I]simply because[/I] it does not have XBL^2. [/QUOTE]

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