the faceplate on the prototype design was a nice 4mm thick Al plate, unfortunately the performance was found to be lacking, so we developed a much thinner faceplate which improved matters, from memory it's 1.5 or 2.0mm , once screwed into the cabinet, there should be no issues with faceplate flex.
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https://www.jfcomponents.com/
https://www.jfcomponents.com/
once screwed into the cabinet, there should be no issues with faceplate flex.