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RD vs Sundown?
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<blockquote data-quote="sundownz" data-source="post: 6703948" data-attributes="member: 549523"><p>Comparison of NS motor to DP motor :</p><p></p><p><a href="http://www.caraudioclassifieds.org/forum/showthread.php?t=19311" target="_blank">FYI... NS does not = DP - Car Audio Classifieds</a></p><p></p><p>There have been lots of changes to the NS v.1 along the way as well. The newest ones had the spiders bolted down with steel rings, aluminum pole plugs, etc. Glue joint strength has improved quite a bit as well as I figured out better ways to do it.</p><p></p><p>In any event... the newest version of the NS motor is totally different all together -- should be available in a few months :</p><p></p><p><a href="http://www.caraudioclassifieds.org/forum/showthread.php?t=23831" target="_blank">Nightshade v.2 Teaser Picture - Car Audio Classifieds</a></p><p></p><p>Same goes for the Z v.2 which is now available -- quite a bit updated from my older stuff :</p><p></p><p><a href="http://www.caraudioclassifieds.org/forum/showthread.php?t=29500" target="_blank">Z v.2 15" Production Unit - Car Audio Classifieds</a></p><p></p><p>---</p><p></p><p>The NS v.2 is a good example of why I really am not a big fan of the Overhang x-max standard. It has a 71mm long coil and a 40mm tall top plate so you get 15.5mm by overhang -- 70% BL you get 27mm. Which do you think is more accurate for a driver with a huge magnetic gap and extremely long coil ?</p><p></p><p>Same could be said for the Z v.2 with a 50mm long coil and a 32mm tall top plate -- 9mm isn't a realistic x-max figure for a driver like that. FEA predicts 20.5mm by 70% BL method.</p><p></p><p>Overhang IS pretty close on LCSG designs, though -- something like a JL 13W7 with a 75mm long coil / ~12-15mm top plate comes out much closer to FEA / Klippel / DUMAX excursion with overhang. LCLG designs tend to be way off, though. Then you have XBL^2 designs (which is what Nick - Electrodynamic - deals with now) where a physical measurement is all but useless.</p><p></p><p>It can be said, though, that no system is perfect because so much changes dynamically in a loudspeaker... but to me the Klippel / DUMAX standard come closer to a "universal" system than the overhang standard which cannot even be used to describe some motor topologies.</p><p></p><p>At least we can say we talked about something other than, "Which is louder ?!?! BTL or HDC3 ?!?!" *laughs*</p></blockquote><p></p>
[QUOTE="sundownz, post: 6703948, member: 549523"] Comparison of NS motor to DP motor : [URL="http://www.caraudioclassifieds.org/forum/showthread.php?t=19311"]FYI... NS does not = DP - Car Audio Classifieds[/URL] There have been lots of changes to the NS v.1 along the way as well. The newest ones had the spiders bolted down with steel rings, aluminum pole plugs, etc. Glue joint strength has improved quite a bit as well as I figured out better ways to do it. In any event... the newest version of the NS motor is totally different all together -- should be available in a few months : [URL="http://www.caraudioclassifieds.org/forum/showthread.php?t=23831"]Nightshade v.2 Teaser Picture - Car Audio Classifieds[/URL] Same goes for the Z v.2 which is now available -- quite a bit updated from my older stuff : [URL="http://www.caraudioclassifieds.org/forum/showthread.php?t=29500"]Z v.2 15" Production Unit - Car Audio Classifieds[/URL] --- The NS v.2 is a good example of why I really am not a big fan of the Overhang x-max standard. It has a 71mm long coil and a 40mm tall top plate so you get 15.5mm by overhang -- 70% BL you get 27mm. Which do you think is more accurate for a driver with a huge magnetic gap and extremely long coil ? Same could be said for the Z v.2 with a 50mm long coil and a 32mm tall top plate -- 9mm isn't a realistic x-max figure for a driver like that. FEA predicts 20.5mm by 70% BL method. Overhang IS pretty close on LCSG designs, though -- something like a JL 13W7 with a 75mm long coil / ~12-15mm top plate comes out much closer to FEA / Klippel / DUMAX excursion with overhang. LCLG designs tend to be way off, though. Then you have XBL^2 designs (which is what Nick - Electrodynamic - deals with now) where a physical measurement is all but useless. It can be said, though, that no system is perfect because so much changes dynamically in a loudspeaker... but to me the Klippel / DUMAX standard come closer to a "universal" system than the overhang standard which cannot even be used to describe some motor topologies. At least we can say we talked about something other than, "Which is louder ?!?! BTL or HDC3 ?!?!" *laughs* [/QUOTE]
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