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Soud absorbing PET board (polyester fiber sound absorbing board) has a good performance in medium and high frequency sound. Sound diffusion MDF slats diffuse part of the sound. Thus, the combination of them can ensure the adequate sound energy, high performance of medium and high frequency sound and provide a quiet environment.link:https://www.lvildiy.com/acoustic-panel/acoustic-wall-panel/In-Stock-Free-Samples-Acoustic-Panel-Wall-Wood.html