Since I made that inquiry I've had the chance to actually see how the N3000-based coaxials are constructed. I wanted to find one with a blown tweet in order to experiment with ways to bring them back, since diaphragms are no longer available, but even those are too expensive to purchase and play with.
However, I did run across a fellow who took things into his own hands. His solution is not ideal, but it will get those coaxes back up and running: Altec 601C and the 3000. - diyAudio I don't see why the same couldn't be done by using a horn driver.
For A Specific Rundown On 604 Evolution:
Altec 604 Duplex Speakers and related
And For Elitopus: "I am also interested in the newer PAS, Renkus, and Radian "coax" drivers. I would like to find a cheap pair to play around with."
Me, too! Celestian has just introduced a new line of coaxials in 6, 8, 10, 12, and 15 inch sizes. Their design is similar to the Altec N3000-based units in that the tweeter and woofer both utilize the same magnet structure, but with some big improvements in order to make the tweets rugged.
Coaxial/Twin Cone - Celestion - Guitar, Bass & Pro Audio Speakers
GeeDeeEmm
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