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Question please.
I have never been around ANY type of a gun with a silencer so is it a soft popping sound if used on a handgun?
I did READ that they really protect your hearing even though I ALWAYS USE quality ear muffs AND ear plugs inside of them too. (My Rx eyeglasses have safety lenses too.) ....
This is my understanding from the internet, not actual experience because I've never even seen a supressor let alone used one, but the typical supressor will diminish the sound level by 25-30 dB (decibels). Hearing protection devices also tell you how much they suppress sound, and it is usually in the range of 25 to 35 dB. Noise causes damage through a combination of intensity and time, so lower intensity sound requires more time to damage hearing, and higher intensity sound less time.
Using the data below, if you are shooting a hunting rifle or an AR15 with muffs rated at a 30 dB reduction, you'll experience 137 or 135 dB respectively. If you look at the chart OSHA chart further down, any exposure at that level for a period of time less than 1 second, causes permanent hearing damage. Anything over 140 has no safe exposure time -- damage is instantaneous.
You do get some additional reduction by doubling up on plugs and muffs, but you can't just add the two together because of issues with bone conduction of sound: Double Hearing Protection: Two Devices for Best Hearing Safety I've heard different figures for the additional protection but always in the single digits. This contrasts with a sound supressor on firearm in that the dB reductions would add together -- if a supressor dropped the sound 20 dB before it even gets to you, the 30 dB muffs or plugs you wear would than drop the sound the full amount of their rating for a total of 50 dB in reduction (that drops the AR15 down to 115 dB and no gunshot lasts for 28 seconds, so it would not damage your hearing). You could finally sight in your hunting rifle without suffering permanent hearing loss every time despite hearing protection.
I found this chart of the sound pressure levels for various firearms here: https://www.dakotasilencer.com/wp-content/uploads/2014/05/Silencer_Sound_Comparsion_chart.pdf
And the OSHA guidelines for time vs. intensity here: https://www.cdc.gov/niosh/docs/98-126/pdfs/98-126.pdf?id=10.26616/NIOSHPUB98126
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