UM/S2H/Suppressors/Scopes and More!

[Formidilosus]

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?

Frequency is not generally looked at. Mil-std- 1474 is one of the documents that lays out most “standard” testing.

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?

That is correct. It is not just total max decibel rating that matters, but that is nearly all that has been pushed.

 

[BjornF16]

How many baffles does the prototype UM OTB suppressor have?

 

[Keechi Kid]

There any info being put out for weight?

 

[JGRaider]

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.

I would have thought the AB8/reflex is a direct competitor for this new UM can. Thanks for the info.

 

[andrew_hood27]

5/8x24. I’m not sure if they will make any with 1/2x28. But, there will be an adapter made with shoulder specifically for this can

I’m not the brightest so I just want to make extra sure…this adapter will let me run this can with a tikka ss lite contour barrel cut and threaded to 1/2x28?

 

[littlebigtine]

Whompy

Curious on your thoughts on how different frequency seems to carry differently? Maybe just my own bias but the difference in 4 stroke vs 2 stroke motors seems to be quite substantial in how far their exhaust noise carries. I almost always hear the bass of a 4 stroke long before the whine of a 2 stroke in the woods. I know in nature animals like elephants and whales utilize “bass” frequencies to communicate over miles of land and water. Maybe the bass sounds are preferable for the shooters ear but not for animals picking out the source of a noise 300-1000 yds away? I only have shot 7 animals with my ultra 5 suppressor 100-600 yds. Small sample size but have yet to deal with the animal reacting in a way that was similar to muzzle brakes and bare muzzle shots. 5 of the animals piled up immediately, 2 presented second shot opportunities seemingly without a care in the world. Food for thought.
Another question, does a suppressor with a braked end cap deflect noise in a perpendicular way to the down range target? May be minute, but I would assume it would be louder at the shooters ear compared to the normal endcap equivalent. Wouldnt that mean quieter downrange? Better for hunting, worse for shooting?

 

[Formidilosus]

I’m not the brightest so I just want to make extra sure…this adapter will let me run this can with a tikka ss lite contour barrel cut and threaded to 1/2x28?

Yes.

 

[Harvey_NW]

There any info being put out for weight?

I believe the goal is around 10oz.

 

[HighUintas]

Curious on your thoughts on how different frequency seem to carry differently? Maybe just my own bias but the difference in 4 stroke vs 2 stroke motors seems to be quite substantial in how far their exhaust noise carries. I almost always hear the bass of a 4 stroke long before the whine of a 2 stroke in the woods. I know in nature animals like elephants and whales utilize “bass” frequencies to communicate over miles of land and water. Maybe the bass sounds are preferable for the shooters ear but not for animals picking out the source of a noise 300-1000 yds away? I only have shot 7 animals with my ultra 5 suppressor 100-600 yds. Small sample size but have yet to deal with the animal reacting in a way that was similar to muzzle brakes and bare muzzle shots. 5 of the animals piled up immediately, 2 presented second shot opportunities seemingly without a care in the world. Food for thought.
Another question, does a suppressor with a braked end cap deflect noise in a perpendicular way to the down range target? May be minute, but I would assume it would be louder at the shooters ear compared to the normal endcap equivalent. Wouldnt that mean quieter downrange? Better for hunting, worse for shooting?

Low frequency can travel further than high frequency. Regarding animals, the only thing I've been able to find is that deer hearing range primarily overlaps with humans but they don't hear low frequency as well and can hear higher frequency better. I have never seen any data regarding elk.

 

[DangerRanger]

I fully expect My ddc lti will be much quieter, but the idea of this for tree stand and woods hunting overall length reduction is still quite exciting

 

[wyosam]

Agree. I have KGM R30 on 22" barrel, and at 7.3" and around 13-14 oz with mount, it is noticeably heavy and awkward compared to my 18" barrel. I may get the 22" fluted to shave some of the forward weight off the #3 sporter to help.

I only have one suppressor, so nothing to go on other than the Pew Science data. It seems to me that if suppression is your #1 priority (45+ rating) you're still stuck with the 9" cans. If suppression is a priority, but handling and weight are others, sacrifices must be made, and a budget must be considered. Again, not an expert by any means, but I just don't see anything in the Pew data that tells me I need to spend over $600 on a suppressor. Please educate me on what I'm missing. Below are the 3 I'm considering for my next can.

Razor 7.62- 6.4" length / 39.5 suppression 33/38	$599.00
KGM R30- 7.3" length / 39.9 suppression 25/39	$599.00 (sale price and sometimes lower when in stock)
Polonium 30- 5.8" length / 37.1 suppression 25/36	$550.00

This is for practice and hunting situations only, so even though I believe all are rated for belt fed full auto, I won't ever abuse them. The shortest is the loudest, the quietest is the longest and heaviest, but the razor falls right in the middle.

For the low price at a little weight penalty class cans, the AB A10 is a great can at under 500. It’s a noticeable difference in balance on my 20” barreled rifles than the raptor 6, but it’s not near as noticeable on my 16”.


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[philcox]

What are your plans to make this (suppressor) available to those of us in California?

Seriously, this is one of those threads that I love to follow, but it (suppressor, not scope or S2H) is out of reach ... all the rest of you ENJOY!!!!

 

[BjornF16]

I would have thought the AB8/reflex is a direct competitor for this new UM can. Thanks for the info.

The Raptor 8 is 6.3” long without reflex.

Raptor 6 is 5.5”; Raptor 4 is 4.7”

Raptor 4 with 4” reflex would be the closest to what UM is designing to in overall length and very similar to the design goal weight of 10-ish oz.

From what I’ve gathered, the UM can has significantly more baffles than 4.

Would love to see comparison to Raptor 6 and 4 w/reflex.

 

[HighUintas]

Yes I'd like to see the best iteration cross sectioned.

 

[SteveAndTheCrigBoys]

Yes I'd like to see the best iteration cross sectioned.

I think Otter Creek could help with that.

 

[HighUintas]

I think Otter Creek could help with that.

I'm referring to the UM specifically