Quote:
Originally Posted by Victory Pete
It is like keeping a truss rod very tight with a straight neck, it makes the neck more stiff and improves volume, sustain and tone.
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"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.