Any time a soundwave hits glass, the glass absorbs the frequency on the wave, starts to vibrate at exactly the same frequency and after that transmits that frequency to one other side of your glass. *Sales tax & delivery fees not bundled. Shipping rates fluctuate by region and order dimensions https://jasperdwglq.elbloglibre.com/26329499/5-tips-about-condensation-resistant-glazing-in-w1k-you-can-use-today