How does a Reflective sound barrier such as the Sonowall Reflective work?

An acoustic screen or sound wall gets its effectiveness from proper placement between a noise source, such as traffic or neighboring noise, and a receiver, such as yourself in your yard. By placing an obstacle in the direct sound path of noise pollution in the form of a sound wall with certain properties such as mass, absorption and gap density, you obtain a low-noise shadow zone behind the wall. Thanks to this shaded area, for example, you can enjoy a quiet garden.

This principle is also called the “Principle of Maekawa,” after the Japanese professor who researched and mapped it extensively. Maekawa examined the effect on different frequencies of sound and mapped noise reduction behind a sound wall. For example, he stated that the performance of a sound wall depends on a number of parameters: The distance of the sound source from the wall, the height of the wall and the distance to the receiver behind the wall. (note: add schedule)

Our SonoWall reflective achieves outstanding results using a universal and simple concept from physics: The Spring-Mass-Feather effect. The system of our SonoWall works as follows: sound collides with the first mass and causes it to vibrate. The spring between the two layers captures this vibration and acts as a shock absorber. The sound is then transmitted to the second mass at a greatly attenuated level.

By designing a panel with a solid wood cladding on both sides of the panel of 1.5cm thickness (the 2 masses) and by incorporating inside the panel our acoustic core of recycled polyurethane flake mats (the spring), we achieve top results with SonoWall as a solution to various types of noise pollution. With our Sonowall, we create up to -34dB (RW) sound insulation according to the ISO-717-1 standard. And all this with a screen only 6.5cm thick! Other industrial noise barriers, seeking to achieve the same acoustic values, are composed of pure mass such as concrete. This not only has a big impact on the price tag, but of course also on the look of the sound barrier.

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