Chris Fitzgerald said:Where's the port on that cab? Are all of the little black triangles along the edge of the blue face porting spaces?
The black triangles are blocks of high density (11 ply? 13 ply?) painted plywood that the grill screws into. These blocks are permanently secured to the baffle. I assume Don likes the snugness of this kind of grill mounting, even though it's a lot more work to produce, as opposed to using long screws that are 'exposed' on their way to the baffle board.