Rough Back Plate Frequency Response (5 mm thickness)

Frequency repsonse
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Back plate frequency response after rough hollowing to 5 mm.

When the 5 mm thickness was achieved, a preliminary resonance curve was measured (just for fun) using a method adapted from the book by Wake.
Clearly shows mode 2(?) and mode 5 resonances in agreement with tap tones.
275 Hz is a little below C#, and 373 Hz is a little above F#.