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Post date: Aug 25, 2020 2:2:40 PM
The back plate is of lesser performance wood and arch height is left 18 mm, this I think is why the nodal line of M5 is closer to the center, than usual.
By tapping, two frequencies are heard/visible on FFT spectrum analyzer. It's important not to follow the other one called M0, it's higher and will give a too low final M5, when hollowing out the inside.
M5
M0
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