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.

    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
       
    2. Markku
      Inspired

      Markku Director 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.")
       
    3. AUTHOR
      AUTHOR
      Lesky

      Lesky Member

      Tinnitus Since:
      12/1997
    4. CDNThailand

      CDNThailand Member

      Tinnitus Since:
      11/17/2016
      Cause of Tinnitus:
      MP3, Stress, TMJ

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