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#1 Posted : 31 January 2008 15:46:00(UTC)
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Posted By David Martin
Does anyone know of any research that looks into evaluating the advantage of doubling-up hearing protection.

I am aware you cannot just add the Assumed Protection values together and that the advantage is somewhere between 5dB and 10dB but I need to be qble to quote some research report that backs this up.

Thanks in anticipation
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#2 Posted : 31 January 2008 16:00:00(UTC)
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Posted By John Richards
I think it would be nearer 3dba.
30db of quieting + 30 db of quieting = 33dba reduction .
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#3 Posted : 31 January 2008 16:14:00(UTC)
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Posted By David Martin
I don't think its as easy as that either John. Something to do with bone conduction having an affect.

I read an American document that quoted 5dB - 10dB but it didn't name the source.
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#4 Posted : 31 January 2008 16:37:00(UTC)
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Posted By Mitch
Google bone conduction and sift through the proverbial, start with a look at this, http://www.ncbi.nlm.nih....etailview&indexed=google
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