Quote:
Originally Posted by JonWint
"Stiffness" is only determined by the structural member dimensions and its Young's modulus (E).
Keeping a truss rod "very tight" will change the relief. The stress in the truss rod will not affect stiffness.
You can build a prestressed top system but it will not increase stiffness.
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I disagree. If you tighten trussrod as much as possible counteracting the pull from the strings, the neck will be stiffer just as a neck with no strings and a loose trussrod will be less stiff.