Drivers for Rod Elliott active sub woofer

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I like the possibilities offered by this approach
Sub-Woofer Controller
but using a Linkwitz transform controller
Linkwitz Transform Subwoofer Equaliser
Somewhere on this forum I've seen some very favourable comments on a car sub woofer speaker, but, of course, coming back I can't find the thread.
All I can remember was that it had a rather complex segmental magnet assembly. Can anybody help identify it please. Also if anyone has built one of these sub woofers would they please get in touch (nothing found on a search, of course). Thanks
Steve
 
Somewhere on this forum I've seen some very favourable comments on a car sub woofer speaker, but, of course, coming back I can't find the thread.
All I can remember was that it had a rather complex segmental magnet assembly. Can anybody help identify it please. Also if anyone has built one of these sub woofers would they please get in touch (nothing found on a search, of course). Thanks
Steve
The Alpine subs?

http://support.alpine-usa.com/products/documents/OM_SWR_S06212011.pdf

http://www.diyaudio.com/forums/subwoofers/192539-tapped-horn-lazy-impatient.html
 
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