The cases are made from sheet fiber board. It has wood veneer on one side. They use a CNC router table type machine that cuts groves into the back side of the sheets. They are then folded, using glue to make the joints solid. This technique allows for a continuous wood "wrap" around the corners. It looks better than cutting veneer and joining at the edges. I've tried to re-cover older Axiom speakers with wood veneer, they turned out OK, but not as good as the Axiom wood speakers.
A speaker case made from any type of solid hardwood, would be inferior to a case built with fiber board. At least from a density / rigidity perspective.
