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post #2 of Old 08-04-2011
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The latter works by absorption, generally in the higher frequency ranges, the former more as a barrier in lower frequency. As a point of reference, I installed something similar to the foam, (1.5" noise attenuating ceiling tile), in my Islander 30 and could perceive no change in noise level. I fear in my case that the noise is getting transmitted right through the beds to the hull. If you install something, be please let us know how it worked out.

Islander 30 MKII "Sojourn"

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