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One can learn a whole lot at this forum ( as well as a couple of others ) by simply implementing the search word veneer ( for a complete LHF site search ) .

I've also seen mentioned that an almost...

You're welcome Ed.

Here a look at Art J's Hi-end crossover ;

http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=47259&d=1282790460

:)

I wouldn't buy the Eminence networks . There's no telling how they will interact with your Altec components .

All-n-all, I believe you are best to buy ( via eBay ) a pair of N501-8a's ( if the...

Generally, Altecs 416 series of woofers are known to work best ( for extended LF ) within @ 9 cu' cabinets, tuned to @ 30hz .

Also, one wants to build with ( fairly ) closely matched woofers ( to...

Should you want to try a lower crossover point, here's the basic schematic ( though polarity of the horn might need to be flipped ) .
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A reasonable starting point for your "custom network" would be to mate the LC values detailed in the N809-8A, to the mid-range suppression circuitry of the 30903/4 network .
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