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Nodal lines M5/M0

posted 25 Aug 2020, 07:02 by Peter Grankulla   [ updated 25 Aug 2020, 07:03 ]
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.