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Ear plugs and SNR and NRR

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shaunnutley | 23:44 Thu 24th May 2007 | Science
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A pair of earplugs have a Noise Reduction Rating of 33dB and a Single Number Rating of 39dB. Would these both be able to block a sound of 36dB (regardless of frequency)? How can you be assured to block 39dB yet the other rating suggest only 33dB? I read that it doesn't matter which rating you use it will still block the stated figure, but if it blocks only 33dB then clearly it won't block 39dB. I know its obvious that they are measured differently, but can anyone shed some light on this?
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Avatar Image rojash
Useful info (plus pdf downloads) here:

http://www.elvex.com/facts03.htm
09:24 Sat 26th May 2007

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