[quote name='Roland Rock' timestamp='1381601443' post='2241307']
Wood has alternating layers of dark, thin wood (latewood), and paler, wide wood (earlywood). The latewood is much more dense than the earlywood.
Quartersawn timber, being cut radially, has lots of straight layers packed pretty close together. A similar width of tangentally sawn timber will pass through far fewer layers, and they appear to be much wavier and more spaced apart.
So it's simply the fact that quarter sawn has a higher concentration of the dense stuff in it.
TBH, I don't know how significant it would be in terms of tone.
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The denser wood can be cut from the centre of a tree at any angle , the trick with quarter sawn is that it is cut radially through the centre , the main idea behind this is consistency of grain direction so that when it dries, the direction and shape of the timber is predictable .
When making anything that needs excellent stability most woods are engineered into laminates and that gives a much greater degree of stability .