I had someone point out to me that I should clarify why there's only a few options on two points.
Each of the individuals I listed, and many more, have gone on the record about having heard the changes. (I had listed Bill Collings and Bob Taylor, and it was interesting to see sblock mention guitars from another fellow in his post, Chris Martin, who also has gone on record about "opening up" being an observable phenomenon.)
First, there are only two possibilities that would lead to them saying they heard the phenomenon of opening up:
- They believe they heard something.
- They *know* they didn't hear something, and are therefore lying when they say they did.
If they did hear something, there's two possibilities:
- "Opening up" genuinely exists as a phenomenon.
- All those experts in instrument construction got it wrong in that one place where they disagree with the one person's opinion.
The only two possibilities which allow those individuals to go on record and say they heard something *without* it existing are:
- The ears and expertise which have resulted in decades of top instruments just got this one wrong.
- They deliberately lied about having heard something when they know they didn't, possibly for a profit motive.
When sblock mentions that "they may have a conflict of interest which you should consider," and "they had something to gain" by claiming they heard something which they didn't, that certainly fits that last one. Additionally, sblock employed innuendo to get there.
Really, when challenging a claim, one shouldn't give support to that claim at the same time. That seems obvious.
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As to why the instrument plots differ from one plot to plot over time, and whether a "statistically insignificant" variation in decibels is inaudible or not, it would seem impossible to state with confidence. In fact, in reading the study I discovered that the researchers don't dismiss the changes evident in the plot as insignificant as sblock has.
I do find it interesting that while this study concludes that the Tonerite didn't affect tone.
However, even the investigators note the following, starting the last paragraph at the bottom on page 8: "Interestingly, subtle but significant changes are also observed for the guitars before and after treatment. However, these changes were essentially the same whether or not the guitar was subjected to the vibration treatment. So these differences are due either to the small amount of playing during the player trials (about 1-2 hours total), the passage of time (about three months), the changing of weather from late summer to fall in Palo Alto, or irreproducibility of our measurement method. ...Hence it is likely that the changes in frequency response function represent a real change. However, there is no significant difference between the effects of the control treatment and the vibration treatment." They observed instruments changing over time, possibly due to playing time.
I agree that this study shows no evidence of the Tonerite affecting the instruments. However, it does possibly provide evidence of instruments changing over time, and (strangely enough, as noted by the researchers) of that change being consistent.
That actually does nothing to rule out the idea that the people I mentioned (and numerous others), who have gone on record as having heard an instrument "opening up," actually heard the phenomenon. Even your chosen study shows "significant changes," and given your endorsement of the researcher's independence, that rules out questioning his fiduciary incentives in his findings.
Interesting study, incidentally.
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