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Considering the length of time this thread has been around, I'm surprised no one had gone scientific and used a sound level app on their phone to measure the before and after sound levels.
These apps are not really too accurate but would show a difference if there is one. The actual value may not be that important only the fact that there is either a significant improvement or a marginal one.
I guess if someone was a real keener he could remove and re-install his set to do the test. Would be interesting to see the results. Could be they are just dirt stops not sound barriers.
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