How do you calculate the noise reduction rate when using earplugs and earmuffs at the same time?

Discussion in 'Support' started by Lesky, Jan 18, 2014.

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    1. Lesky

      Lesky Member

      Tinnitus Since:
      12/1997
      How do you calculate the noise reduction rate when using earplugs and earmuffs at the same time?

      If you have earplugs with a NRR of 33 dB and ear muffs with a NRR of 30 dB.

      What would the correct total NRR be?

      Please also explain your calculation :)

      I tried googling this, but did not find any clear answer.

      Thanks in advance!
      /L
       
      Lesky, Jan 18, 2014
      #1
    2. Markku
      Inspired

      Markku Founder Staff Benefactor Hall of Fame Advocate

      Tinnitus Since:
      04/2010
      Cause of Tinnitus:
      Syringing
      See my post here: https://www.tinnitustalk.com/thread...ir-cells-safe-—-discuss.745/page-2#post-17753

      ("However, the attenuation of the combination is not equal to the sum of the individual attenuation values (Berger, 1983), as illustrated in Figure 1. Note for example; at 1000 Hz the combination of a 26-dB plug and a 34-dB muff does not yield 60-dB overall, but rather about 41 dB. The principal reason is the bone-conduction (BC) limits to attenuation, which are also illustrated in Figure 1.")
       
      Markku, Jan 18, 2014
      #2
    3. AUTHOR
      AUTHOR
      Lesky

      Lesky Member

      Tinnitus Since:
      12/1997
      Lesky, Jan 19, 2014
      #3
    4. CDNThailand

      CDNThailand Member

      Tinnitus Since:
      11/17/2016
      Cause of Tinnitus:
      MP3, Stress, TMJ
      CDNThailand, Mar 3, 2017
      #4

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