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Sound Suppressor Discussion
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PostPosted: Fri Dec 29, 2017 10:16 am 
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You always see in the movies people firing guns with silencers on them that seem to perform miracles. I already know this is all just over-dramatization typical of Hollywood. But to what extent I am not actually certain.
But in a real life scenario how much noise would a $300-500 sound suppressor actually suppress? I've heard varying answers on the question.


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PostPosted: Fri Dec 29, 2017 11:00 am 
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adrienne2242 wrote:
You always see in the movies people firing guns with silencers on them that seem to perform miracles. I already know this is all just over-dramatization typical of Hollywood. But to what extent I am not actually certain.
But in a real life scenario how much noise would a $300-500 sound suppressor actually suppress? I've heard varying answers on the question.


You've heard varying answers because the answer varies by caliber, weapon, ammo, altitude, weather and suppression device just to name a few of the variables.

Typically anywhere between about 25 dB to 35 dB reduction in muzzle report, no reduction in projectile flight noise.

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PostPosted: Sat Dec 30, 2017 3:55 pm 
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22LR will sound like an air rifle after adding a suppressor.

Subsonic 300 blk and 9mm sound comparable to slamming a car door. You can hear it far away but it does not sound like a gunshot, it isnt a sound that grabs your attention.

Supersonic rifle rounds still sound like gun shots, the silencer does nothing to the crack you hear coming from the bullet. Your ears won't ring after shooting one, but they aren't quiet by any stretch of the imagination.

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PostPosted: Sat Dec 30, 2017 8:20 pm 
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The prior answer that says it depends a lot on the caliber and weapon host is the most correct one.

Some calibers and weapons are much louder than others. Others sound better to your ear.

With that said, to your question about a suppressing a gun, many of them are still loud and sound unmistakably like a gun anyway.

The suppressor just takes a lot of the "boomy" out of it.

My example that I think should be used is a car because most people are familiar with how they sound.

Which is especially true since car mufflers are essentially the same principle and designed by the same person as a firearm muffler/silencer.

You take the muffler off a car and it's going to be very loud.

You put a muffler on a car and it's going to be a lot more quiet. But you'll still hear the engine running from a long way off, you'll know it's a car running, and you'll especially hear it when the car is speeding toward you down the street.

Also, when shooting supersonic bullets (which is the most common and available type of ammo), they have a sonic crack downrange that a suppressor cannot and does not affect.

When the bullet surpasses the speed of sound--1100 feet per second as most bullets are, there will be a crack that sounds like a regular 22 rifle shot being fired. This is on top of the sound of the shot when you fired it, so essentially, there are actually two cracks that occur when a bullet is fired. Though your ear usually just picks that up and sounds like one loud noise rather than two, but supersonic crack is more pronounced when you use a suppressor. Either way, you're going to know that someone just shot a gun.

That much is true regardless of which rifle caliber you're shooting from the old 30-30 hunting rifles that have been around for 130 years to the newest super duper magnum hunting cartridges.

Maybe this chart will help answer some of your question.

Unsuppressed firearms are not hearing safe and over 150 decibels.

Even the best case scenario, the suppressor will reduce the sound to around 120-130 decibel area, which is about as loud as your lawnmower and noticeably louder than a car horn, which are usually ~110 decibels.

Suppressed gunshots are in the 120-130 ballpark, and often louder, depending on what gun and caliber you are shooting.

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PostPosted: Sat Dec 30, 2017 11:35 pm 
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I love that under your Chart, your signature says "I don't care what your chart says." LOL

Your chart shows gunshots at 140dB. That's actually the suppressed level for .308s. Supersonic w no can is 166-168 typically. Then a 32-35dB reduction for can. (I think that 135-137dB is bullet flight noise.)

As others have said, it depends upon many factors. Weapon Type: bolt action or other closed gas systems don't generate the cyclic action of parts, nor vent bore gas out of the ejection port. These add noise, so semiautos seem louder b/c the can doesn't lessen their noise, but INCREASES it b/c of adding backpressure.

All of the above Answers are correct. Each adds something of value to our understanding of weapon noise.

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PostPosted: Sun Dec 31, 2017 2:51 pm 
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whiterussian1974 wrote:
I love that under your Chart, your signature says "I don't care what your chart says." LOL


Irony. :lol:

I probably should update my sig line.

That was in reference to the infamous AR15 tier chart.

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PostPosted: Mon Jan 01, 2018 1:49 pm 
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Well, most of mine sound like pew pew :lol:

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PostPosted: Fri Jan 12, 2018 11:37 am 
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doubloon wrote:
You've heard varying answers because the answer varies by caliber, weapon, ammo, altitude, weather and suppression device just to name a few of the variables.



This.

It's also going to depend on where you're shooting. A suppressed gun that is comfortable to fire in the middle of an open field might still hurt your ears if you're shooting right next to a structure.

Most quality cans will render the shot hearing safe, at least for limited exposure. But prolonged exposure to noises in the 130-140 dB range will still damage your hearing, even strings of impulse noises, so it's still a good idea to wear ears, especially with supersonic rifle rounds and lots of shooting. Suppressed supersonic rifle shots generally register 135-140 dB.

I find most subsonic pistol rounds through quality suppressors to be right on the cusp of comfortable if there is anything reflecting noise back, and definitely not indoors. Out in the wide open, my ears aren't offended by 9mm subs and .45 ACP through a good can. Subsonic pistol rounds are typically 125-130 dB

Subsonic .22 LR through a quality can is about the only thing I consider universally hearing safe, even indoors. It'll be right around 115 dB.

Also remember that dB isn't the whole story. Tone/pitch dramatically affects how comfortable a suppressed shot will be to your ears. A lower thud will be less offensive to most people than a higher pitch snap at the same dB (intensity) level. It's one reason that square cans haven't been particularly successful; they tend to produce a strange, sharper tone, despite they're increased internal volume over a round can of equal width and length. The SiCo Osprey is the only not-round can I've found to still produce a pleasant note

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PostPosted: Fri Jan 12, 2018 12:33 pm 
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ECCO Machine wrote:
The SiCo Osprey is the only not-round can I've found to still produce a pleasant note

How are the osprey micro and salvo12 in this regard?

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PostPosted: Sat Jan 13, 2018 11:02 am 
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fishman wrote:
ECCO Machine wrote:
The SiCo Osprey is the only not-round can I've found to still produce a pleasant note

How are the osprey micro and salvo12 in this regard?


The Osprey micro is OK, but there are reasons they didn't fare very well. It's completely different inside and out from the Osprey, too, bearing only a profile resemblance. Aside from mediocre performance, rimfires generally don't benefit from the eccentric profile, as most have perfectly usable sights with standard concentric 1" round cans.

We don't really have much to compare the Salvo with, and I have pretty limited personal experience with it.

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