Klipsch Heresy Speakers circa 1976...Cabinet wood question.


Cabinets... they  look like they are made of plywood but when I called Klipsch they were not sure, but  said that they may be   made of MDF material.
The back says ....TYPE MDBR.  Serial # 25P287.  
Are they made of wood or MDF ?  Opinions please
rocky1313
Mine were plywood.  You can pull a driver to see the unfinished edges.  The commercial version may have been chipboard.  Those were always textured black finish if I recall???
My Klipsch Heresy circa 1980 speakers came in unfinished birch plywood - the cheapest version.  You should be able to tell from the back of the speaker.  There was no MDF option available back then.
I never owned the heresy,but the Khorns and Cornwall’s,I had from that era we’re definitely plywood and no mdf.

Kenny.
My vintage Heresy's are unfinished birch plywood. And I've had Altec Seville's that were also made of plywood. Same for my Rogers LS3/5A's.