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Does it lower the decibels of ambient above-surface noise, to what extent?
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Is it preferential to filtering out low or mid or high frequencies or do they all move through it as a medium about equally in terms of perceptibillity by the submerged end observer?
Roughly, how much in decibel reduction would occur in fairly shallow submersion? Like 5-10db?
What’s being submerged here? The sound source? The receiver? Are both under? or is one or the other out of the water?