So many times people misunderstand OSHA rules. Hearing pro is based on industrial noise in a sustained environment primarily. One time noise levels and sound impact on the ear drum are another issue, separate from industrial work. There is a pile of information out there to help a person understand it all if they want to look into instead of just spewing some OSHA rule that is not designed around shooting. In the end, a rifle is still loud, it can still damage your hearing, but so can a ****ed off wife.
HEARING PROTECTION Protect Your Hearing Noise induced hearing loss and tinnitus are two of the most common afflictions for recreational shooters and hunters. Everyone knows that gunfire is loud, but very few people understand the repercussions that shooting can have on their hearing until it’s...
americansuppressorassociation.com
There we go- that's more like it.
We can't just say " my suppressor is hearing safe"-- there are a multitude of conditions that can change or quantify that satement.
A suppressor on a specific rifle that measures 140dB at your ear really isn't " hearing safe"-- as impulse noise can cause hearing loss at 140db-- at 138 or 139 -- it might be safe now-- but for how long? How many shots
If we use the chart you provided--- impulse noises at 130 dB are " safe" for .879 seconds-- so if we consider the average time of a gun shot being about .002 seconds long--- a suppressor that reduced the sound at your ear to 130 dB would be "hearing safe" for about 440 shots-- so how do we figure out the non-lineral equation for "safe" in between? (especially since sound levels are abstract in that for every 10dB rise you actually double the amount of noise.) You have to use recording devices that measure using "time weighted, and peak dB units"
So at 139dB you might get a few shots before damage but at 130 you might get 400 shots
1 shot from a 357 mag pistol emits the equivalent "noise" of more that 40 hours in a noisy work place. That's a weeks worth of noise in .002 seconds ( close to that of a nagging wife
)
BUT you can't use a $40 amazon sound meter or a phone app to measure impulse noise you'll need a special meter that costs several thousand (or you can actually rent them for a couple hundred per day) --
BUT if you measure the sound of your 308 win rifle with a 24" barrel , with specific ammo then change any variable -- the sound level will change--
20" barrel? More noise- different ammo ? More or less noise-- 300wm with same suppressor? More noise-- you get my point-- a 300 bo won't emit the same dB as a 300wm
I have dealt with osha and msha noise regulations for over 35 years--- the only real way to know when hearing damage may start is by using sampling equipment that measures in "time weighted units" --- and the only real 100% way of preventing hearing loss with loud impulse noises is hearing protection ( plugs or muffs or both).
So to say that suppressors with super sonic ammo are "hearing safe" isn't really correct-- you would need to explain what you mean-- safe for 1 shot with my handloads in my rifle at a specific altitude in specific weather conditions --- or safe for a range officer for 8 hours of continuous work shift--- huge differences in between
If we really get down to it--- anything that has an impulse can also physically "jolt" your body if you are close to it or holding it.....that physical " impulse/jolt" to your body can actually cause damage to your hearing too even if you wear appropriate hearing protection....examples would be jack hammers,holding a small arms fire arms like rifles, and go 1 step bigger, think the impulse concussion of a howitzer at close proximity --- the physical vibration to your body can actually cause hearing loss even when appropriate hearing protection is used---- but that's a whole 'nother subject in and of itself
So generally speaking " hearing safe" suppressors don't really exist for supersonic ammo unless you are hunting and only fire 1 or 2 shots
And for reference-- yes I own suppressors, and love them but they have their uses and limitations
I feel that " hearing safe suppressors" are a marketing term used buy suppressor manufacturers to help sell product.