They are 16 ohm.
Yes, all of them were. Earlier versions had green components, 416Z/806A, realy early ones had green horns. These appear late enough to have fairly uncommon goodies like 416-16B and 802-16G in them, even the series type N500-G XO's are desirable.

Those are some sweet ceiling monitors.
Agreed, i think people overlook them due to their similar aspect and appearance to the 9844. But 9845 is much larger, cabinet volume is close to the 620 or 19 cabinet.

I wonder if there would be worthwhile gains from 16 ohm adjusted mod 19 networks in them.............