Report copyright - Soluções de Isolamento Acústico - Iniciopointplac.pt/uploads/2/9/6/1/29612299/danosa_ensaios_acusticos.pdf · F (Hz) 125 250 500 1k 2k 4k D n (dB) 45,5 47 50 60 70 72,5 L’ n
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