Suppressors Unsuppressed/Braked 308 and Thunder Beast Ultra series on PULSE

[TBACRAY]

I got asked for this video done just like this so here it is. I will redo this outside as soon as weather allows. I think inside sound testing is done. I'll let Turbo elaborate.


Shots go
Unsuppressed/with Brake
MR-170.9
ML- 170.2
SE- 165.7

Ultra 5
MR- 147.7, 146.1, 150.2 Avg-147.9
ML- 149.2, 145.8, 149.0 Avg-148.0
ML/MR Avg-148
SE- 133.7, 136.3, 136.4 Avg-135.5

Ultra 7
MR- 143.1, 141.9, 140.8 Avg-141.9
ML- 141.1, 140.5, 139.5 Avg-140.4
ML/MR Avg-141.2
SE- 131.9, 132.5, 131.6 Avg-132

Ultra 9
MR- 138.1, 136.2, 137.8 Avg-137.4
ML- 137.8, 136.3, 138.2 Avg-137.4
ML/MR Avg-137.4
SE- 129.1, 129.0, 126.8 Avg-128.4

338 Ultra
MR- 133.9, 134.4, 134.0 Avg-134.1
ML- 133.2, 133.5, 133.4 Avg-133.4
ML/MR Avg-133.7
SE- 126.1, 123.8, 124.2 Avg-124.7

 

[SDet]

Sutherland, aka Turbo here to add to what Ray said.



To start, the Pulse is a very powerful system. Even though we only share peak numbers, it can do much more than that. For example, we can do the same analysis that Jay over at Pewsoft is doing, with only a few extra clicks. That said, one of the data points we have it outputting with every shot is when the peak sound level was reached at each microphone.



For an example shot, like the first Ultra 5 shot in this video, the times were 0.100487 seconds for the right microphone, 0.100498 seconds for the left microphone, and 0.106075 seconds for the shooter’s ear microphone. Roughly 10 microseconds different between the two muzzle microphones and about 6 milliseconds later for the shooter’s ear peak. The 0.1 second delay is just to ensure that nothing is missed, since the recording is triggered by one of the microphones, and sometimes, like the unsuppressed shot at the start of this video, the peak happens before the recording is triggered.



The 10microsecond difference suggests that the spacing between the two muzzle microphones is off by about 1/8 of an inch (assuming the speed of sound at 1125 fps), so pretty dead on over a 2 meter distance. The 6 milliseconds would be closer to 7 feet, which sounds fairly reasonable when you consider the distance from Ray’s ear to the muzzle and the direction that the majority of the sound is traveling.



When we started the 338 Ultra string at the end of that video, that no longer held true. That first shot saw 0.005 milliseconds between the two muzzle microphones and 21 milliseconds between the first muzzle peak and the shooter’s ear peak. That tells me that those peaks were not the original sound wave and were actually reflections off of the walls, the ceiling, or possibly the floor. I was able to shift the cut off point to only allow 15 milliseconds after the recording was triggered, but that’s still not perfect, since some surfaces are still closer than that.



Testing outdoors prevents that from being an issue. Grass, dirt, and non-square surfaces reflect much less, and what they do reflect will end up being at a low enough volume that it won’t out class the actual peak that the shooter would experience in a normal outdoor setting.

 

[Newbie2020]

This is good stuff. Thanks for sharing. Keep it coming.

 

[Reload10]

Awesome video. You always have solid data to share.

 

[JBattles]

Great video - Any thoughts on how much moving outside will affect the results?

 

[SDet]

Great video - Any thoughts on how much moving outside will affect the results?

The 9 and 338 will likely get quieter, but I can't guarantee that without actually testing it. Hopefully I'll be able to do that soon.

 

[JBattles]

The 9 and 338 will likely get quieter, but I can't guarantee that without actually testing it. Hopefully I'll be able to do that soon.

Cool stuff - looking forward to checking out the video!