I too was going to guess an array voice-range PA drivers, probably forgettable. You never know but I wouldn't chase after them unless they were easy to catch and I was looking for drivers for projects.
I think I see aluminum dust caps behind those grills. That would mean probably "full range" 8" drivers or something similar. That would mean vocal range only, pretty much- no real bass or upper treble.
Unless those were Stephens or some such FR drivers, they're probably not really anything special. More likely CTS, Utah, Oxford or the like, instead.
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