Allison 3 information, please

I am using my 1976 vintage, re-furbished Allison 3's as a stop-gap while I decide on a replacement for my Kharma 3.2 FEs, just sold. I am driving them with Atma-Sphere MA 2.2's, and need to know their impedance and sensitivity, as a guage for how my amps will drive difficult loads. Can anyone help? Thanks.
P.S. They sound phenomenal!!!! Too bad they're extinct.
Unfortunately, e-mails are returned and the phone line is disabled. I am afraid they are, indeed, sadly, extinct. If you can reach them, I'd be very grateful to hear of it. I would buy a new Allison in a heartbeat.
By the way, I found the specs of my 1976 model, which differ from the one at that website (4 ohms). Thanks, anyway!
If that's the case, then I'd start calling their dealers. There's a listing on the site. You never know...if the company did go belly up, they may have been stuck with some old stock they'd be happy to unload at closeout prices. Heck, I may do that myself...I always wanted a pair of the Fours...Good luck!