UM/S2H/Suppressors/Scopes and More!

[HighUintas]

We did an informal sound/dB test two days ago with 4 different versions of the OTB can. These are NOT official numbers- we did not measure the distance to the shooters ear exactly, nor net it up exactly as they will when the finalized design is tested. This was just for comparative sake to see where the designs are.



Rifle was a 20” barreled 308 Winchester, using Winchester M118LR ammunition.


Setup-
View attachment 845693


The “ear” microphone was approx 36-40” left of the shooters left ear.


Where the OTB can sits currently, Average of 138 dB-

View attachment 845697





Compared to a TBAC Ultra 7 at 136dB
View attachment 845699



And a TBAC Ultra 5 at 140dB-
View attachment 845700


4 inches past the muzzle and it is within 2 Db of one of the highest regarded (by a lot of people) 7 inch suppressors on the market. 4 inches added OAL and it’s 2 dB “quieter” than probably the highest regarded 5 inch suppressor.
The goal is to get it in the 135-137 dB range and keep it in that 10’ish oz weight.




Subjective observations:

The TBAC Ultra 5 is barely a suppressor. While it meters at 140 dB it is CRACKY. The first prototype OTB can metered 142dB at the shooters ear on a 16” 223, and sounded way less obnoxious. The TBAC Ultra 7 and the OTB cans sound totally different to the shooter, to the side, and in front of the muzzle. Maybe the most descriptive way to say it is that- at the shooter and from the side, the TBAC UL7 sounds like a “PPPFFFT” with a crack to it. The OTB can sounds something like “WHOOMP” with a thud to it.

Kind of like this-
View attachment 845705


From the front, the OTB can is barely heard or noticed over the supersonic crack- the “thud” just gos unnoticed. Whereas with most cans from the front, you notice the muzzle crack at least somewhat.

Can you say if there's any plans to test the UM against the ultra 7 with cartridges and barrel lengths that rokslide shooters tend to use? 18" 6 cm, 223, 6um, etc.

That's a pretty stellar comparison to the ultra 7 only being the one of the first prototypes.

 

[Marbles]

A comparison to the Raptor 8 with a 3 inch or 4 inch reflex would be a nice one (as well as flush mount).

 

[Formidilosus]

Can you say if there's any plans to test the UM against the ultra 7 with cartridges and barrel lengths that rokslide shooters tend to use? 18" 6 cm, 223, 6um, etc.

Of course. 20” 308, M118LR is a standard that is known.

That's a pretty stellar comparison to the ultra 7 only being the one of the first prototypes.

I’m pretty satisfied where we are with it so far.

 

[Formidilosus]

A comparison to the Raptor 8 with a 3 inch or 4 inch reflex would be a nice one (as well as flush mount).

We’ll do it, but there isn’t a comparison there. A 1.625” diameter , 6.3” long can with a 4 inch reflex is a completely different class of can. It will be quieter, by quite a few dB.

That’s not the point of this can.

 

[khuber84]

@Formidilosus was the ultra7 tested gen1 or gen2 can?

 

[Roor]

Is this direct thread only or HUB compatible?

 

[pattimusprime22]

Given it's going OTB, it should only be direct thread compatible.

 

[Formidilosus]

Is this direct thread only or HUB compatible?

Direct thread only.

 

[Formidilosus]

@Formidilosus was the ultra7 tested gen1 or gen2 can?

I’m waiting for an answer.

 

[Marbles]

We’ll do it, but there isn’t a comparison there. A 1.625” diameter , 6.3” long can with a 4 inch reflex is a completely different class of can. It will be quieter, by quite a few dB.

That’s not the point of this can.

Good point and thanks for the reminder.

 

[Formidilosus]

@Formidilosus was the ultra7 tested gen1 or gen2 can?

Gen 1.

 

[Formidilosus]

 

[Wprinkle]

View attachment 847462

Well how do they sound? Ping/crack or whumph

 

[DisplacedHusky]

View attachment 847462

Those look pretty handy. What barrel length are they cut to?

 

[prm]

Any determination on available calibers this will support?

 

[Formidilosus]

Well how do they sound? Ping/crack or whumph

Whompy

 

[Formidilosus]

Those look pretty handy. What barrel length are they cut to?

18” barrels.

 

[Formidilosus]

Any determination on available calibers this will support?

They’ll be tested on a 20” 300 RUM- but that isn’t what this one is made for. This is a can for mid cartridges- 308, 6.5cm, 243win, etc. I would guess that 6.5prc will be about the upper range for full performance.

 

[Scottyboy]

Very happy to see it’s very “comparable” to the TBAC 7 as thats what I use. Cannot wait for these to become available!

 

[TOLeary]

We did an informal sound/dB test two days ago with 4 different versions of the OTB can. These are NOT official numbers- we did not measure the distance to the shooters ear exactly, nor net it up exactly as they will when the finalized design is tested. This was just for comparative sake to see where the designs are.


Where the OTB can sits currently, Average of 138 dB-

View attachment 845697

Compared to a TBAC Ultra 7 at 136dB
View attachment 845699

And a TBAC Ultra 5 at 140dB-
View attachment 845700


4 inches past the muzzle and it is within 2 Db of one of the highest regarded (by a lot of people) 7 inch suppressors on the market. 4 inches added OAL and it’s 2 dB “quieter” than probably the highest regarded 5 inch suppressor.
The goal is to get it in the 135-137 dB range and keep it in that 10’ish oz weight.




Subjective observations:

The TBAC Ultra 5 is barely a suppressor. While it meters at 140 dB it is CRACKY. The first prototype OTB can metered 142dB at the shooters ear on a 16” 223, and sounded way less obnoxious. The TBAC Ultra 7 and the OTB cans sound totally different to the shooter, to the side, and in front of the muzzle. Maybe the most descriptive way to say it is that- at the shooter and from the side, the TBAC UL7 sounds like a “PPPFFFT” with a crack to it. The OTB can sounds something like “WHOOMP” with a thud to it.

Kind of like this-
View attachment 845705


From the front, the OTB can is barely heard or noticed over the supersonic crack- the “thud” just gos unnoticed. Whereas with most cans from the front, you notice the muzzle crack at least somewhat.

I’m curious if the frequency is measured, or if it isn’t why not?

Are the decibels measuring the spl, total loudness, of the rifle shot?

Im asking these because when you mention the crack, pfft, whomp sound of each type of suppressor that leads me to think that frequency should be more of a driving factor in how a suppressor is design with overall loudness being next or Atleast equal. From what it seems like you’ve noted, the whomp sound could have a higher decibel measurement (overall louder) than the crack sound but because of the frequency it’s less harmful, noticeable, etc..

“The human ear's sensitivity to different frequencies is not equal, with the most sensitive range being between 2 kHz and 5 kHz. This means that the subjective loudness of a sound is not solely determined by its sound pressure level but also by other complex factors. Furthermore, this difference in frequency sensitivity is more pronounced at low sound pressure levels than at high ones. The equal loudness contours in the figure show the sound pressure level required at any frequency to give the same apparent loudness as a 1 kHz tone. For instance, a 50 Hz tone must be 15 dB higher than a l khz tone at a level of 70 dB to have the same subjective loudness.”

This is from Svantek’s website. Just got me curious if the frequency is taken into account - how much, should it be more or is there even enough of a frequency change that could make a difference?