The noise quieting of the Prairie screw works on a different principle.
2.
Perhaps the most important effect of such full-range noise quieting is a broadened dynamic range.
3.
Unique new 18 " x 8 " diameter 15-spoke aluminum wheels included a new noise quieting technology : a polypropylene " Helmholtz resonator " that encircled the center portion of the inside of the wheel.
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