When hit, a golf face acts as a trampoline or spring, which is one reason why the USGA refers to how hot a face can be as its "Spring Effect and Dynamic Properties" rule.
As a matter of physics, the highest trampoline effect of an oval shaped golf face has always occurred in the the center of the face.
Major brands have used “variable thickness technology” for decades. This technology has the thickest part of the face in middle of the face, where the highest trampoline effect exists, and then progressively thinner outside the center of the face to reduce at least some of the significant loss of distance when the ball strikes outside the center of the face where trampoline effect is much lower.
Knuth Golf invented the novel idea of creating
three, largely independent but connected "trampolines" or "3 sweet spots" with novel average thicknesses in the center of the face and adjacent areas in order for the first time to create a trampoline effect higher in the areas outside the center of face compared to the center of the face as permitted by the new USGA Rule.
By doing so, we were able to create a much higher trampoline effect outside the center of the face so amateur golfers can now for the first time obtain the same distance across the entire face whether they hit in the traditional sweet spot for maximum distance or the 2 new sweet spots on their driver or on their fairway wood and hybrid approach shots for more greens in regulation for lower scores.