. Dans-la-cavité, 3) de la double paroi, est placé un matériau granulaire léger, par exemple poreux, dont les grains (5) ne sont liés ni entre eux, ni aux plaques (2, 3). L'ajout d'un tel matériau granulaire améliore en particulier l'isolation acoustique de la double paroi aux basses fréquences, située entre les deux plaques

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