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Good quality fibreglass acoustic tile fitted in there would help with the reflected noise, could double up or add Dow 703 behind.
EDIT, if you are only trying to keep the noise from going through density of material should do that, two layers of MDF soft adhesive in between. guessing most of the noise is in the 500hz range rock wool or fibreglass should absorb that easy enough.
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Last edited by 908/930; 06-29-2024 at 03:34 PM..
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