I have an idea that I would like to propose that I believe would provide data we might benefit from. I have a piezo design based on information gathered from around the web, as well as a very practical implementation that @Duplo42 came up with. This thread has some of the details, as well as some sound files from his experiments. My proposal is this: I will build and test a piezo pickup system similar to what @Duplo42 put together. Sound files will be provided, as well as pertinent details of how the sound files were captured (e.g. piezo on top of headstock secured by double sided tape, etc.). Once I am done with my tests I will mail the system to the next person in line and they will do the same, ad infinitum. My hopes are that others would be interested in this and participate, and that a body of data could be amassed from a variety of different builders, players, etc. I realize that there are a LOT of variables, and let me be clear that this is not intended to prove anything, but to compare results. I also realize that there could easily be concerns with privacy, potential financial issues with international shipping, etc. Before I get too far into this I thought it would wise to query the TalkBass community to see if there is any interest. I also thought that the Luthier's Corner the most appropriate forum for this thread, but if I am in error please move it to where it's most appropriate. Thoughts?