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<blockquote data-quote="OlogyAudio" data-source="post: 1494732" data-attributes="member: 562170">I don&#039;t know if I&#039;d go so far as to bring XBL2 into this publicly -- and here rly isn’t the place...&nbsp; XBL has its merits -- just extended pole overhung and underhung do their jobs very well too.&nbsp; The largest advantage to XBL2 has yet to be used (that I know of atleast)...&nbsp; In the grove in the top plate that should be completely filled with copper and the grove should be very very deep for use in subwoofers...&nbsp; Just my .02...The trick with short coil underhung, with the thick hex former and the multiple faraday sleeves is... you need a huge magnet...&nbsp; This is a sacrifice people weren&#039;t willing to make for the bottom line I guess?&nbsp; This is also the only downside to underhung… It can get very expensive especially if you were to use this in a subwoofer with say… over 30-40mm of xmax instead…&nbsp; For this use I’m a big fan of going extended pole overhung with liberal use of copper in the gap.&nbsp; BL is still quite flat though there is little you can do to avoid the inevitable drooping curve you get with overhung at the extremes of excursion.&nbsp; Also for less expensive subs with moderate xmax…&nbsp; It is the best way to keep costs down.That’s all I’m saying for now on my own about this topic…</blockquote>

[QUOTE="OlogyAudio, post: 1494732, member: 562170"] I don't know if I'd go so far as to bring XBL2 into this publicly -- and here rly isn’t the place... XBL has its merits -- just extended pole overhung and underhung do their jobs very well too. The largest advantage to XBL2 has yet to be used (that I know of atleast)... In the grove in the top plate that should be completely filled with copper and the grove should be very very deep for use in subwoofers... Just my .02... The trick with short coil underhung, with the thick hex former and the multiple faraday sleeves is... you need a huge magnet... This is a sacrifice people weren't willing to make for the bottom line I guess? This is also the only downside to underhung… It can get very expensive especially if you were to use this in a subwoofer with say… over 30-40mm of xmax instead… For this use I’m a big fan of going extended pole overhung with liberal use of copper in the gap. BL is still quite flat though there is little you can do to avoid the inevitable drooping curve you get with overhung at the extremes of excursion. Also for less expensive subs with moderate xmax… It is the best way to keep costs down. That’s all I’m saying for now on my own about this topic… [/QUOTE]

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