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what? WHAT???

Discussion in 'General Gun Discussions' started by BugOut, Nov 5, 2012.

  1. BP Hunter

    BP Hunter Well-Known Member

    I still think empty 9mm casings still work best. Ask Gunny himself.:D
  2. 230RN

    230RN Marines on Mt. Curibacci

    Anyone have a clue about how wearing eyeglasses (or other eye protection) under the muffs affects the effectiveness?

    I don't wear the regular range goggles since I have industrial eyeglasses with thin temples, but it seems to me the wide temples on the goggles would be kinda "leaky" under the muffs.

    Terry, 230RN
  3. Reloadron

    Reloadron Well-Known Member

    Interesting thing about hearing protection. Go to the range and put the ears on. Then while shooting is going on gently press the ears closer to your ears. Notice a decrease in the sound levels? Regardless of the numbers hearing protection is only as good as the fit. While hearing protection with a poor fit will attenuate the sound a good fit with a good seal around the ears is imperative.

  4. Safetychain

    Safetychain Well-Known Member

    Reloadron, I fully agree that pressing the earmuffs against the head will better the fit but just putting the palms of your hands on the hard shell of the earmuffs reduces the surface area of the hard shell to the outside which will increase the attenuation in addition to dampening the vibration of the hard shell. I use a cheap pair of Harbor Freight electronic muffs (with a cuttout at 70-80 db) in addition to plugs. I am sure the $15 muffs are not nearly as good as a pair of $100 muffs but I am satisfied. A snap of the fingers or clapping of the hands will activate the shunting circuit and with the volume turned high, you can carry on a conversation and hear the range commands easily through the plugs.
  5. Reloadron

    Reloadron Well-Known Member

    Absolutely! The newer electronic muffs are great. Have to love those things. :)

    My only point was in my opinion the fit of hearing protection is important. When on the range we know what is too loud as shots are fired. The noise level should be comfortable and when that is achieved, we are good to go. Really matters not if the hearing protection is $15 Harbor Freight or a set of $100 super duper acoustical hearing protection. We know when loud is too loud.

  6. denton

    denton Well-Known Member

    That's true. I use my shooting muffs when I'm running my table saw or my snow blower. Open your mouth, and the volume increases. And that points out a limit to both ear plugs and muffs: When you reach a point that you are getting most of the sound through your mouth or through bone conduction, there is no point in adding more attenuation at the ears. That seems to happen around 30-35 dB.

    As pointed out, dB are logarithmic. 10 dB is a factor of 10, 20 dB is a factor of 100, and 30 dB is a factor of 1,000 in sound pressure level. 3 dB is very close to being a factor of 2.

    So cheap earmuffs that attenuate 23 dB reduce the sound pressure level by a factor of about 200. Harbor Freight sells a pair rated at 33 dB, which is a factor of 2,000. That's quite a difference. 23 dB muffs are very inadequate. A rifle muzzle blast is around 150 dB at 1 meter, so 33 dB muffs get you down to 117 dB. That's still a lot.

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