I don't think that Andy's goal is to build a sterile guitar with very little overtones, but to build one with less opposing ones or off tone ones. The V bracing is an attempt to guide the overtones into ones that are more like the primary one.
What comes to my mind is a twelve string guitar. I think most people can't tell when their 6 string is a tiny bit out of tune, from one string to the next, but if you have one of the strings of a 12 string pair off, it really is obvious. The tones are no farther off than most people play their 6 string, but because the 12 string pairs are SO close, the tones seem to highlight their differences.
Perhaps Andy is trying to keep the top from resonating in harmonics that are a touch out of tune from the fundamental and related frequencies. Or, maybe I have missed his explanation by a wide margin.
Could it be that the X bracing was not designed for best possible sound, but easiest way to make the top strong enough for steel strings and still light enough to resonate loud enough ?
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2010 Guild F47R
2009 G & L Tribute "Legacy"
1975 Ovation Legend
1986 Ovation 1758 12 String
2007 Walden G2070
2008 Guild D55 Prototype
1998 Guild Starfire IV
2016 Guild Newark St. X-175 Sunburst
1996 Ovation 1768-7LTD " custom "
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