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Posted: 1/3/2012 5:34:35 PM EDT
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Dug up a good topic that shows off the compressor upper.
http://www.ar15.com/forums/t_2_282/204227_.html |
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Quoted: We did a little bit of sound testing today. 164db with no suppressor 134.3db with MRS suppressor 109db with LRS suppressor These were based off of a 10 shot average. There was quite a few 128db shots with the MRS. Ammo used was 75 grain Hornady. These are not "official" results but this will give you guys an idea of what the Compressor and the new MRS and LRS suppressors are capable of. No |
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Quoted: Quoted: We did a little bit of sound testing today. 164db with no suppressor 134.3db with MRS suppressor 109db with LRS suppressor These were based off of a 10 shot average. There was quite a few 128db shots with the MRS. Ammo used was 75 grain Hornady. These are not "official" results but this will give you guys an idea of what the Compressor and the new MRS and LRS suppressors are capable of. No Care to elaborate? |
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Quoted: Quoted: Quoted: We did a little bit of sound testing today. 164db with no suppressor 134.3db with MRS suppressor 109db with LRS suppressor These were based off of a 10 shot average. There was quite a few 128db shots with the MRS. Ammo used was 75 grain Hornady. These are not "official" results but this will give you guys an idea of what the Compressor and the new MRS and LRS suppressors are capable of. No Care to elaborate? Unless they were using Red Jackets DJ microphone, this is impossible. The sound pressure level created by the BCG moving to the rear is greater than 109dB. The supersonic crack has a much higher sound pressure level than 109dB. At the ear, with a .22lr bolt gun and a good can, 109dB...maybe, with subsonic ammo (CCI Standards are ~114dB - 120dB at the ear with X can on Y day with Z bolt gun). If you have any understanding of dB measurement you will know that the difference between 109dB and 135dB is astronomical. It is logarithmic, not linear. It is not the differnce between 109mph and 135mph (which is still a pretty big difference). Sound pressure levels are measured much differently. For a reference, I believe SilencerCo measured a slap to the face on their YouTube Video "How Loud Is It" at `~114dB. Granted, that was a 1 slap average.  EDIT: An M4 has a Sound Pressure Level (SPL) of ~165dB. Saying that you reduce from 165dB ––> 109dB is saying that the can has a ~99% reduction in SPL. |
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We did a little bit of sound testing today. 164db with no suppressor 134.3db with MRS suppressor 109db with LRS suppressor These were based off of a 10 shot average. There was quite a few 128db shots with the MRS. Ammo used was 75 grain Hornady. These are not "official" results but this will give you guys an idea of what the Compressor and the new MRS and LRS suppressors are capable of. No Care to elaborate? Unless they were using Red Jackets DJ microphone, this is impossible. The sound pressure level created by the BCG moving to the rear is greater than 109dB. The supersonic crack has a much higher sound pressure level than 109dB. At the ear, with a .22lr bolt gun and a good can, 109dB...maybe, with subsonic ammo (CCI Standards are ~114dB - 120dB at the ear with X can on Y day with Z bolt gun). If you have any understanding of dB measurement you will know that the difference between 109dB and 135dB is astronomical. It is logarithmic, not linear. It is not the differnce between 109mph and 135mph (which is still a pretty big difference). Sound pressure levels are measured much differently. For a reference, I believe SilencerCo measured a slap to the face on their YouTube Video "How Loud Is It" at `~114dB. Granted, that was a 1 slap average. First slap pop? 
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Quoted: Quoted: Quoted: We did a little bit of sound testing today. 164db with no suppressor 134.3db with MRS suppressor 109db with LRS suppressor These were based off of a 10 shot average. There was quite a few 128db shots with the MRS. Ammo used was 75 grain Hornady. These are not "official" results but this will give you guys an idea of what the Compressor and the new MRS and LRS suppressors are capable of. No Care to elaborate? That post illustrates one of two very important pieces of information - Either 1. the makers of this product have not a clue about their craft. Even a casual reader of silencer technology would know those numbers are impossible; or 2. the makers of this product think their customers are very stupid. Buyer beware. |
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Quoted: That post illustrates one of two very important pieces of information - Either 1. the makers of this product have not a clue about their craft. Even a casual reader of silencer technology would know those numbers are impossible; or 2. the makers of this product think their customers are very stupid. Buyer beware. Honestly, I think they have no clue about their testing equipment. It would be important to notate the equipment used, a baseline (unsuppressed), as well as suppressed results. Equippment has to be maintained and certified. With that type of can, on that short of a barrel (going by pics because rifle details were not stated), I would say 134dB at the muzzle is damn good. I would seriously doubt that they were getting 134dB at the muzzle. That leads me to this...WTF is a dB? Most people talk in dB reduction. How many people even know what it is? I have been guilty of it myself. "ABC" can has a 34dB reduction. Well, isn't that f'ing awesome?! 99% of people don't have a clue what a dB is. Most people think its just the "loudness" or "noise." Well, sort of. Generally, the results we see posted are peak sound pressures at a certain distance from the muzzle (some also measure at shooters ear). A dB is a measurement of sound PRESSURE. Sound pressure can also be measured in PSI with a calculation. Most people know PSI becasue of our car tires. WTF is PSI in sound terms? I think for people to know what they are buying, they need to have a better understanding of sound pressures. For example, 135dB ––> 130dB is ~50% reduction in SPL. I would say that is pretty significant. Most folks don't really care. They just want the "best." 109dB would be the "best." Unfortunately, at this juncture, I don't think that it is obtainable with a center fire semi-automatic rifle. I could be wrong, however. I have been wrong before and will be again. Green0 would be able to tell you what is what. Kel would be able to tell you what is what (or he could just ask Dr. D.). |
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That leads me to this...WTF is a dB? Most people talk in dB reduction. How many people even know what it is? I have been guilty of it myself. "ABC" can has a 34dB reduction. Well, isn't that f'ing awesome?! 99% of people don't have a clue what a dB is. Most people think its just the "loudness". Well, sort of. Generally, the results we see posted are peak sound pressures at a certain distance from the muzzle (some also measure at shooters ear). A dB is a measurement of sound PRESSURE. Sound pressure can also be measured in PSI with a calculation. Most people know PSI becasue of our car tires. WTF is PSI in sound terms? I think for people to know what they are buying, they need to have a better understanding of sound pressures. For example, 135dB ––> 130dB is ~50% reduction in SPL. I would say that is pretty significant. Most folks don't really care. They just want the "best." 109dB would be the "best." Unfortunately, at this juncture, I don't think that it is obtainable with a center fire semi-automatic rifle. I could be wrong, however. I have been wrong before and will be again. Green0 would be able to tell you what is what. Kel would be able to tell you what is what (or he could just ask Dr. D.). ***I'd just ask Phil. :) He's got the chops to talk the science of sound. I've got the chops from the John Alexander Smith school (referencing his famous commencement quote "...nothing that you will learn in the course of your studies will be of the slightest possible use to you in after life – save only this – that if you work hard and intelligently, you should be able to detect when a man is talking rot, and that, in my view, is the main, if not the sole purpose of education.”) "164db with no suppressor 134.3db with MRS suppressor 109db with LRS suppressor" is... talking rot. 
Kel ETA: Felt it appropriate to say that my comments should not to be construed that I'm saying the item in question is bad or good - just saying the numbers are obviously not rooted in proper measuring protocol. |
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I guess nobody went to the actual topic of origin?
http://www.ar15.com/forums/t_2_282/211661_time_to_save_my_pennies___suppressor_related__.html&page=1#i1736229 Tom originally posted 109, but when someone questioned him about it, he said he made a typo and changed it to 119. That said, 119 on an 8" barrel with a 9.25" long suppressor sounds....optimistic? |
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I guess nobody went to the actual topic of origin? http://www.ar15.com/forums/t_2_282/211661_time_to_save_my_pennies___suppressor_related__.html&page=1#i1736229 Tom originally posted 109, but when someone questioned him about it, he said he made a typo and changed it to 119. That said, 119 on an 8" barrel with a 9.25" long suppressor sounds....optimistic? Considering the best .22 suppressors meter in the 120s, it's very optimistic. |
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I guess nobody went to the actual topic of origin? http://www.ar15.com/forums/t_2_282/211661_time_to_save_my_pennies___suppressor_related__.html&page=1#i1736229 Tom originally posted 109, but when someone questioned him about it, he said he made a typo and changed it to 119. That said, 119 on an 8" barrel with a 9.25" long suppressor sounds....optimistic? Considering the best .22 suppressors meter in the 120s, it's very optimistic. Exceedingly. |
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I guess nobody went to the actual topic of origin? http://www.ar15.com/forums/t_2_282/211661_time_to_save_my_pennies___suppressor_related__.html&page=1#i1736229 Tom originally posted 109, but when someone questioned him about it, he said he made a typo and changed it to 119. That said, 119 on an 8" barrel with a 9.25" long suppressor sounds....optimistic? Considering the best .22 suppressors meter in the 120s, it's very optimistic. Exceedingly. I completely agree. Unless there's more to the story, that number is unrealistic. M3 metered the bolt closing on an AR to be around 118 if I remember right. |
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I guess nobody went to the actual topic of origin? http://www.ar15.com/forums/t_2_282/211661_time_to_save_my_pennies___suppressor_related__.html&page=1#i1736229 Tom originally posted 109, but when someone questioned him about it, he said he made a typo and changed it to 119. That said, 119 on an 8" barrel with a 9.25" long suppressor sounds....optimistic? Considering the best .22 suppressors meter in the 120s, it's very optimistic. Ive seen Silencerco meter their sparrow in the 115-116 range though. Could that have been subsonic? |
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I guess nobody went to the actual topic of origin? http://www.ar15.com/forums/t_2_282/211661_time_to_save_my_pennies___suppressor_related__.html&page=1#i1736229 Tom originally posted 109, but when someone questioned him about it, he said he made a typo and changed it to 119. That said, 119 on an 8" barrel with a 9.25" long suppressor sounds....optimistic? Considering the best .22 suppressors meter in the 120s, it's very optimistic. Ive seen Silencerco meter their sparrow in the 115-116 range though. Could that have been subsonic? I believe they were using cci standard velocity in that test and they had an average of 118-120db out of the "new" sparrow. |
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I have not seen the meter tests for 115dB results. I read some tests at about 118-122dB for the Sparrow..
There's always going to be a little spread from test to test, day to day, gun to gun etc. I have never seen anything other than .22lr meter near 120dB or below, and though I'm no expert, 109, or even 119 for that setup would be extraordinary, or a "game changer" if they were legitimate. |
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That could have only been better if Rick James did it. |
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The new surpressor that Spikes is releasing in March is 119db from the testing they have done. It is not yet listed on the site but he did show a pic of it.
It's the LRS-1 Spikes Industry Thread |
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The new surpressor that Spikes is releasing in March is 119db from the testing they have done. It is not yet listed on the site but he did show a pic of it. It's the LRS-1 Spikes Industry Thread I simply don't think that's possible. |
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119db just doesn't sound possible with a can that size. Kinda makes ya wonder just what equipment they are using to test and how they are performing their testing, doesn't it? Because something certainly isn't right with that number. Maybe it is another "typo".
Mark |
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