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.

Dismiss Notice
Sign up to Tinnitus Talk
    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 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.")
       
      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

Share This Page

Loading...
Similar Threads - calculate noise reduction
  1. DimitarIV

    Noise-Induced Tinnitus Since March 2018 — Now It's Been Gone for Two Weeks

    DimitarIV, Nov 17, 2018 at 10:20 PM, in forum: Success Stories
    Replies:
    3
    Views:
    162
    Striveon
    Nov 18, 2018 at 1:02 AM
  2. newarrior

    Loud Noise as a Public Health Hazard

    newarrior, Nov 17, 2018 at 7:14 PM, in forum: Awareness & Fundraising
    Replies:
    0
    Views:
    29
    newarrior
    Nov 17, 2018 at 7:14 PM
  3. Jimmoton

    Low-Pitch Tinnitus — Noise-Induced?

    Jimmoton, Nov 15, 2018 at 6:45 PM, in forum: Support
    Replies:
    2
    Views:
    69
    Audiophile_bg
    Nov 15, 2018 at 10:25 PM
  4. butterfly75

    Most Unexpected Loud Noises You've Encountered

    butterfly75, Nov 14, 2018 at 2:18 PM, in forum: Support
    Replies:
    12
    Views:
    222
    Starthrower
    Nov 15, 2018 at 11:58 PM
  5. Paulmanlike

    Is Some “Head Noise” Normal That Everyone Has, or Is It a Component of Tinnitus?

    Paulmanlike, Nov 10, 2018, in forum: Health Talk
    Replies:
    4
    Views:
    232
    Steve Ebhodaghe
    Nov 14, 2018 at 5:53 AM