Closest match on the EV archives for a datasheet I saw was the EV Sixteen, which I believe is very similar: http://archives.telex.com/archives/EV/Speakers/

I don't think these were anything special. I think they were quite similar to the EV "ETR" series of home speakers hawked by Warehouse sound in the 1970's. Nothing like vintage EV drivers or cabinets.

You can see the EV ETR-18 at:
http://img.photobucket.com/albums/v223/mhardy6647/scan.jpg
(you may see it above?)