I've edited my post above to include photos of the actual item.
This is the first chance I've had to actually get it inside and hooked up. There's a lot going on right now and no room to move! I took Mungkiman's suggestion and removed the grille, which actually is attached to the baffle with six screws only accessible after you remove the L-bracket screws and then lift-off the top along with the side grilles. I didn't feel it was necessary to remove the baffle as the iPhone flash shots clearly show the EV woofer (zoom in to see the EV logo on the dust-cap!) and two upper-frequency drivers. I've also read that there's a special adhesive that attaches the baffle to the cabinet and acts as a seal, so I didn't want to disturb it, ITIS. I'll shoot through the back opening with a flashlight when I can get to it showing the plates on the drivers.
I'm listening to it right now with one channel of a Stan Getz album (Moments in Time) playing from my iPod through a Crown D-45 amp. Volume controlled by the Crown input attenuators. I did set the iPod EQ to Loudness to get a good balance. The Shorthorn is very bright at low volume if not given some EQ right out of the iPod. Probably benefits greatly in the low-end when situated in a proper corner placement. Seems to be quite efficient, though, and all drivers are working rather sweetly. Horns on horns have always been a favorite of mine!
Still looking for a good home for this one. I figured the local Klipsch dealer might showcase it in their showroom for the paltry sum it would cost them. I'll try to contact the principal there and make him an offer he shouldn't refuse. Right now I'm enjoying the thrilling return to yesteryear that this beautiful piece of audio history provides.