ALL MESA® ENCLOSURES are made using the finest Void-free, Marine Grade Baltic Birch in varying thicknesses of no less than 9 ply and as many as 14 ply. Super strong rabbet corners are glued and nailed and all backs are gasket sealed to ensure an air-tight seal. Baffles are fitted with superior dado joint construction and braced. Grilles are wrapped around a separate grilleboard, not the baffle board. Grille material is made of strong twisted jute dipped in a special coating that filters top end for a sweeter response. You simply won’t find a better cabinet.