Do Commercial Theaters Use Multi Center Channels?

The two theater installations I've had the oppertunity to check out behind the screen, many years ago via friends, were THX certified JBL installations that had three identical full-range speakers (L/C/R) across the stage using some of these, and these.

More vintage JBL pro stuff here.

And pro THX Info here

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Yes. They are pro speakers like used at concerts. Multi driver arrays that are bi or tri amped. See link to a jbl cinema speaker designed to be behind a screen.

http://www.jblpro.com/catalog/general/Product.aspx?PId=324&MId=1