I am in the process to rebuild a Cornwall I pair in the horizontal collector version in mahogany finition. (will be beautiful!)
However US Plywood thickness standard = 3/4'' = 19 mm doesn't correspond exactly to european= either 18 or 22 mm!
What you, Cornwall lovers and klipsch lovers, would recommend. I think that the cabinet design , type of wood and thickness has an influence on the quality of the sound. Paul Klipsch
did kow that for sure! . 22mm could be too much?
Jp from Switzerland