Front Plate (with f-holes, without bar) Frequency Response
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Front plate frequency response after the f-holes have been cut,
but before installing the bass bar.
(Again, the measured peaks are 5-10 Hz lower than the tap tones
probably due to the extra mass of the driver coil.)
123 Hz is B, 232 is Bb,
296 is D+, and 429 is between Ab and A (middle-C is 262).