Set up the plate upside down supported by the foam patches, see red rectangles in Figs.The speaker is connected to a power amplifier, which is in turn driven by a sinus signal generator, ie a PC with tone generator software. The red rectangles denote the positions of foam patches which support the plate at the nodes. The vibrational response of the free plate can spatially be divided in areas with strong response should be placed. These responses can be visualized with the help of small particles. The free plates, when excited at certain frequencies, give exceptional responses. With all these, you should keep a log for every violin you build so that you can refer back to it in case your instrument turns out to have an exceptionally good tone. These methods are not a complete solution in themselves, but may help you produce, in time, better sounding instruments. I think that using the following methods to measure the frequencies of the free plates as you are working on them can add to your understanding of how the sound system of the violin works. Some makers claim that free plate tuning is for that reason a waste of time. It is difficult to assess the relationship between the resonant frequencies of the free plates and the plates in an assembled violin.
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