Colonial Armory Sprung for a Sound Meter.

[RangerWalker71]

I recently picked up a B&K 2209 Meter.
This is used in Mil-Spec standard testing for Sound reduction.
Standards are:
testing in accordance with MIL-STD-1474D using calibrated military-approved equipment and provide these or unweighted results. Measurement equipment includes calibrated Brüel & Kjær model 2209 Impulse Precision Sound Level Meter with 20 μs rise time using GRAS pressure measurement microphone model 40BP (Bruel & Kjaer model 4136 equivalent) while positioned one meter left and level with muzzle, oriented upward, and 1.6 meters above dirt/grass. Digital samples are taken from AC output signal path by M-Audio Solo at 10.4 μs intervals (96,000 per second) and 24 bit resolution (16.7 million possible steps). Recording hardware rise-time has been estimated at (using the 0.35/BW formula) 8.75 microseconds while the microphone is estimated to have a rise-time of 5.0 microseconds. Total system calibration during each use with Brüel & Kjær model 4220 Pistonphone. Sound analysis is linear to better correlate with perception. Linear measurement results in higher levels than 'A' weighing and this data should not be compared to MIL-STD data. Temperature and humidity measurements by Kestrel meters. Silencers will be examined for evidence of artificial environments. If present, this will be noted unless the medium can be removed.

I only did 5 shot averages not 10 to conserve ammo, I have a lot of testing to do.

Here are some of the numbers for the SAS Barricade.
.260 REM 24" barrel Unsuppressed Ave. 168.5 DB
Suppressed average 141.1DB
Suppressed level at shooters ear. 127.8DB

Barricade on a 556 16" AR. 138DB

Hope this helps. Will be posting several more as i get them.
If you want something metered let me know and I'll do the best i can to accommodate your request.



Keep calm, exhale, and squeeze.

 

[RangerWalker71]

Made it to the range today. I was hesitant to post these, due to them being elevated over the posted numbers from TBAC.
I made a few calls and did some research and they are in line with what other people are getting.

Weapon: FN SPR 308 22" barrel FGMM 168GR.
73 degrees, 43% humidity 30.30in pressure elevation 1240"
Mil-Spec standards 5 Shot, Vs's 10 though

Ave Unsuppressed was 165.5DB

Ultra 9 Ave 135.8
#1. 135.6
#2. 137.3
#3. 134.1
#4. 137.1
#5. 135.2

Ultra 7 Average 139.1DB
#1. 137.7
#2. 139.2
#3. 141.1
#4. 137.1
#5. 135.2

Here are some Pictures from Silencershop vids with their meter number.

 

[RangerWalker71]

Here is the Arbiter numbers from today. Same conditions same rifle, same ammo. 5 shot strings again for testing,

#1. 134.3
#2. 134.4
#3. 135.8
#4. 136
#5. 137

Average 135.5

Reaper
#1. 140.1
#2. 140.3
#3 142.1
#4 142
#5. 141.8

Average 141.26

Feel free to cuss and discuss among your selves.

 

[RangerWalker71]

Hoping to get some data on 22-250 on some 556 suppressor.
If there are any suppressors you want tested, let me know. I'll do what i can to get out and do it.