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Dismountable Fabric Wrapped Wall Panels , Fiber Glass Wool Insulation For Houses What is acoustic insulation? Most people think if we just block off the noises outdoor that is acoustic insulation. Actually it is not perfectly right. Acoustic insulation works by absorbing sound and vibrational energy. The key principle is to convert sound energy into kinetic energy. Glasswool is a good sound insulator because the flexing action of the fibers absorbs the sound and dissipates it