I agree with all of this except one thing: My own chronograph tests prove that that exact same round fired in my pistol is about 200fps slower than from my carbine. Therefore the pressure in the carbine must be reaching higher levels because pressure IS directly related to velocity.The simplest answer is ‘no.’ Sound is generated by the sudden release of high pressure gases at the muzzle at the moment of bullet exit, The higher the pressure the older the bang. The exception to that is a barrel length that is too long to achieve maximum powder burn and therefore presume at bullet exit. So the shorter barrel of a pistol would produce less Dbs than the loner barrel of a carbine. That said understand that the difference between the two guns would not be distinguished by human hearing. A 9mm round at standard pressure will produce an average Db rating of 159. Firing +P and +P+ will be higher than standard pressure. The Db level will vary with barrel length, but it could only be measured by a proper measuring device. I learned the above by reading about suppressor design. As I wrote at the start of this post: Sound is generated by the sudden release of high pressure gases at the muzzle at the moment of bullet exit,
Therefore the pressure in the carbine must be reaching higher levels because pressure IS directly related to velocity.
Yes, assuming the same ammo is being used, the longer barrel will be quieter. MP5 is quieter than a Glock 19. Heck, my .44 magnum rifle with 20" barrel is quieter than a .22 pistol with 3 inch barrel.So, the title pretty much says it all. If you're using the same ammunition, how much less "bang" do your ears perceive from a 16" carbine over a handgun?
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I agree with all of this except one thing: My own chronograph tests prove that that exact same round fired in my pistol is about 200fps slower than from my carbine. Therefore the pressure in the carbine must be reaching higher levels because pressure IS directly related to velocity.
I do not necessarily agree with that.My point was your hearing will not notice the difference
I do agree with that.Hearing protection is necessary no matter what the barrel length of a 9mm gun.
You can find pressure curves that show definitively that the pressure drops as the bullet moves down the barrel.Therefore the pressure in the carbine must be reaching higher levels because pressure IS directly related to velocity.
It most certainly will, unless your hearing is already damaged. Proper hearing protection does not automatically make all loud sounds the same. Quieter loud sounds are still quieter than louder loud sounds, even with ear plugs or muffs.My point was your hearing will not notice the difference.
That's a difficult question to answer. Supposedly the human ear can distinguish between the sound power of noises that differ by as little as 1dB....how much less "bang" do your ears perceive from a 16" carbine over a handgun?