Rusty Messages: 1186 Registered: May 2018 Location: Kansas City Missouri
Illuminati (3rd Degree)
I used 1/4" solid birch wood that I glued together to cover the face of the cabinet over the mdf. Wayne says and it makes sense to not use ply that may have voids within it that may buzz with loose particles in the voids. I spread out wood glue with a card and clamped it down with all my clamps and some heavy items for a few days. It's held up very well. I built the theater 4 Pi's, (discontinued) many years back. Great speakers I've never tired of.