Not absorbing or blocking sound, but diffracting it so that it ‘evaporates.’ For years, 4Silence has been trying to show that it can be done. After years of struggling to convince skeptics and also comply with regulations, the company seems at long last to be able to reap the rewards. The basic concept is the so-called WHISstone. It is a concrete element which has grooves. A horizontal sound wave travels up through the grooves thanks to the collision of molecules. This leads to a noise reduction of 2.5-3 decibels.
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