Sound Testing A Dozen LDCs

[Earl]

7 of the 10 tested without pellets were more quiet WITH pellets.
It would be interesting to see the results from lower powered air guns and also pistols like a PP700 or PP750.
My Maximus shoots JSB 8.44 at 890 fps = 14.8 ft lbs and is LOUD without Geo's LDC.

This is VERY good information:
"Also the sound deadening effect is notably dramatic going from bare barrel to any LDC. Even the loudest unit, the Polish Wolf 30mm, was noticeably quieter than the bare barrel. It should be remembered that on the decibel scale, doubling the intensity corresponds to an increase of 3 dB. This does not correspond to a perceived doubling of loudness, however. We perceive loudness to be doubled when the intensity increases by a factor of 10, which corresponds to a 10 dB increase. So we would perceive the bare barrel (98.83 dB) to be about twice as loud as the Wolf 30mm (88.43)."

[Thane]

Great test!

Another at low volume/low velocity would be an interesting comparison.

I find that small reductions in speed can often reveal a threshold point where the sound is significantly reduced.

[mrbulk]

7 of the 10 tested without pellets were more quiet WITH pellets.
It would be interesting to see the results from lower powered air guns and also pistols like a PP700 or PP750.

So noted Earl. I don’t have that PP750 pistol any longer but for lower power maybe a Diana Chaser (CO2) might fit the bill.

[mrbulk]

Great test!

Another at low volume/low velocity would be an interesting comparison.

I find that small reductions in speed can often reveal a threshold point where the sound is significantly reduced.

Interesting point Thane, a velocity “trip point” threshold...it would be useful to see if the big boy units are effectively quieter than the little guys when tested at slower speeds because if not, that might tell us something even more useful...like using specific units for specific power applications.

[Earl]

7 of the 10 tested without pellets were more quiet WITH pellets.
It would be interesting to see the results from lower powered air guns and also pistols like a PP700 or PP750.

So noted Earl. I don’t have that PP750 pistol any longer but for lower power maybe a Diana Chaser (CO2) might fit the bill.

Yes, the Diana Chaser CO2 with the 8 inch barrel would be a great test.
My Mrodair CP-2 CO2(same as the Diana Chaser) with the 8 inch barrel and LDC is very quiet but it is pretty loud inside without the LDC.
It shoots JSB 8.44 at 486 fps = 4.4 ft lbs.

[JungleShooter]

🔴 Silencer Specs Table 🔴

▪50 Silencers▪10 Silencer tests▪6 calibers▪Diameter from .88"  to 2.0"▪Length from 2.9" to 10.5"▪Prices from $26 to $270
▪Links


Happy silencer shopping everyone. 😄

Matthias

❌ Attachment Silencer Specs Table Version 20:

[JuryRigger]

Thank you for this, an excellent way for an inexperienced new buyer to really get an idea of what they're looking at/for.
Will be bookmarking for future reference,
Jesse
PS-And thank you JungleShooter for compiling existing data and maintaining a table of it, efforts like this are what sets the GTA forum up a notch!

[MaineJim1821]

Thank you for your efforts!

[mrbulk]

7 of the 10 tested without pellets were more quiet WITH pellets.
It would be interesting to see the results from lower powered air guns and also pistols like a PP700 or PP750.

So noted Earl. I don’t have that PP750 pistol any longer but for lower power maybe a Diana Chaser (CO2) might fit the bill.

Yes, the Diana Chaser CO2 with the 8 inch barrel would be a great test.
My Mrodair CP-2 CO2(same as the Diana Chaser) with the 8 inch barrel and LDC is very quiet but it is pretty loud inside without the LDC.
It shoots JSB 8.44 at 486 fps = 4.4 ft lbs.

Oh, with the pistol barrel? Yeah, my .22 sure is loud as heck with the short barrel! I was thinking with the 19" rifle barrel...but the pistol barrel might be a better test since most of the gases would still be traveling quite fast within the 8"...

[Rallyshark]

Did you notice a significantly different tone coming from the standard Falx as I did with the high flow version?  Just as a lower powered test would be interesting, I think a higher powered test would be as well! 

[mrbulk]

Did you notice a significantly different tone coming from the standard Falx as I did with the high flow version?  Just as a lower powered test would be interesting, I think a higher powered test would be as well!

Good question Donny but to tell the truth, I did not really notice only because I was all caught up in making sure the sound meter was set to freeze the highest dB reading on each shot among other stuff. Plus I was outside with many ambient sounds, as well as the neighbor's A/C cycling on and off right on other side of wall, plus jet planes passing overhead so I had to wait for things to pass by and/or cycle off for every shot. It was tedious (although enjoyable) and I'm not so sharp no more...but I'll try to get an isolated comparo a bit later, see if I can differentiate high pitch vs low, etc. No guarantees though, I've had a lifetime of employment-required quarterly firearms qualifications and the like, and back in the really "olden days" when i was a rookie we felt only sissies wore ear protection while shooting (which I truly regret now)...

[Rallyshark]

Gotcha 

[mrbulk]

Gotcha 

In fact for "type of sound" tests I may need to enlist my wife and daughter to be my auditory guinea pigs again...

[Nomadic Pirate]

Yep, very important to have someone down range to actually tells you what they sound from the other side.

Looong time ago I used to have a Marauder .25 and an early days Rainstorm .22,
To me the Rainstorm sounded louder, but one day I had a friend over shooting and first I had him stay downrange and then I did while he was shooting them, we both agreed that the Marauder was actually louder or it sounded louder.

[Stewie]

Thank you for making the significant effort to generate the data AND present it in a logical and easy to understand format.

I've seen some "data" that's impossible to interpret, this is EASY.

Let me second that emotion! Easy-to-understand format. Yes. Very clear.

[mrbulk]

Thank you for making the significant effort to generate the data AND present it in a logical and easy to understand format.

I've seen some "data" that's impossible to interpret, this is EASY.

Let me second that emotion! Easy-to-understand format. Yes. Very clear.

Thanks Robert! Simple is as simple does, and I am for exactly that - simple.

[mrbulk]

Yep, very important to have someone down range to actually tells you what they sound from the other side.

Looong time ago I used to have a Marauder .25 and an early days Rainstorm .22,
To me the Rainstorm sounded louder, but one day I had a friend over shooting and first I had him stay downrange and then I did while he was shooting them, we both agreed that the Marauder was actually louder or it sounded louder.

Good point Manny, in fact I had to avoid using the Evanix AR6K despite it having the "loudest bark" subjectively. Mainly because of the slight air leakage from between the mating surfaces of the pellet cylinder and the breech block. Regardless of the silencer used up front, the secondary air leakage right near the shooter's face always makes the gun seem loud to the shooter. Downrange ears would help eliminate that.

[Earl]

Below are some decibel readings using my iphone 7 with the Decibel X app. and averaging 5 shots inside my den.
Benjamin Marauder shooting JSB 10.34 grain at 782 fps, 76.6 decibels at 6 feet left of the muzzle, 91.4 decibels at the shooter's ear.
Crosman Challenger shooting JSB 8.44 grain at 603 fps, 86.7 decibels at 6 feet left of the muzzle, 90.5 decibels at the shooter's ear.
Beeman P17 shooting RWS R10 7.0 grain at 398 fps, 88.8 decibels at 6 feet left of the muzzle, 100.9 decibels at the shooter's ear.
The Marauder sounds like a dull thud at the shooter's ear.
The P17 is a sharp crack at the shooter's ear.
The Decibel X app. gave consistent readings. Example: 76.6, 76.9, 77.1, 75.8, 77.0

[mrbulk]

Below are some decibel readings using my iphone 7 with the Decibel X app. and averaging 5 shots inside my den.
Benjamin Marauder shooting JSB 10.34 grain at 782 fps, 76.6 decibels at 6 feet left of the muzzle, 91.4 decibels at the shooter's ear.
Crosman Challenger shooting JSB 8.44 grain at 603 fps, 86.7 decibels at 6 feet left of the muzzle, 90.5 decibels at the shooter's ear.
Beeman P17 shooting RWS R10 7.0 grain at 398 fps, 88.8 decibels at 6 feet left of the muzzle, 100.9 decibels at the shooter's ear.
The Marauder sounds like a dull thud at the shooter's ear.
The P17 is a sharp crack at the shooter's ear.
The Decibel X app. gave consistent readings. Example: 76.6, 76.9, 77.1, 75.8, 77.0

Earl, thanks for your helpful input! Are any (or every) of the guns moderated at all? I know the mrod has baffles in the shroud, correct?

Also curious how you were able to get the slightly different dB readings between the muzzle and the ear. That would be a definite improvement on testing protocols, did you need to use two phones?

[Hoosier Daddy]

Took Maxine out with the Tanto and my cell phone playing music was much louder.
For you poor folks living in an urban setting I suggest playing something neutral and soothing like this in the background...  cranked to 11 to mask the report.
Trust me... they won't mind the airgun.