I did some more investigating and I'm pretty sure the bottoms are the Speakerlab K units. The tops are custom designed (obviously), with the JBL2405 slot tweeters mounted on the outer edge of the Altec 811B sectoral horns. I took a look at the crossover and it is marked with a Speakerlab label.(see link to photo at ) I still have to open the cabinets to see the woofers....I'm hoping they are Altec 803B's.
Here is a link to six photos of the corner horns:
http://www.flickr.com/photos/76563585@N03/
Here is a link to six photos of the corner horns:
http://www.flickr.com/photos/76563585@N03/