Drivers for Rod Elliott active sub woofer

[evetsfrance]

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

[weltersys]

Originally Posted by evetsfrance

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/produc..._S06212011.pdf

Tapped Horn for the Lazy and Impatient

[evetsfrance]

Thanks, that's 'em.
Steve

[EWorkshop1708]

Would a Lanzar Optidrive 1232d be an alternative to the Alpine?

[evetsfrance]

Originally Posted by EWorkshop1708

Would a Lanzar Optidrive 1232d be an alternative to the Alpine?

It's certainly a beast. I'm a bit stuck by what I can get hold of in the wilds of France. Alpine has a dealer in our local one horse town.
Can anyone help with calculating the resonant frequency of a speaker in an IB enclosure ? WinISD doesn't seem to do it.

Steve