Speaker Lab

That looks like a standard 7 (smaller mid horn), but with the larger tweeter. Those were a mod of the standard 7's, though sometimes referred to as Super 7's (not officially though).

The speakers you have are the original "Super 7" (not to be confused with the later (1981) Super 7, which was the redesign that went away from horns). they consisted of the bass cabinet from the Seven and the midrange and tweeter horns from the K's. The Super 7 was a speaker that wasn't ever really production, and wasn't ever featured in any of the catalogs. They were built to order in various cabinet shapes and sizes and never sold with full crossovers (most often tri-amplified with active crossovers). If someone wanted passive crossovers, parts and general design were provided, which may be what was done here. For folks from Seattle, the Seattle Center Lazerium originally had Speakerlab K's, but they were changed out to Super 7's at some point in the late 70's (and then changed to a full pro-audio system in the early '80's). Our Current Super Seven uses planar magnetic ribbons instead of horns (slspeakers.com or find us on facebook). PS For those of you attending the Rocky Mountain Audio Fest this week, we will be exhibiting in room #2018, come by and see us!