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Suppressed Nation direct comparison metering videos

Discussion in 'NFA Firearms and Accessories' started by Gtscotty, Jun 15, 2019.

  1. Gtscotty

    Gtscotty Member

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    The Suppressed Nation YouTube channel in conjunction with Hansohn Brothers' has been posting up a series of videos that feature back to back, same host metering of popular silencers done with B&K 2209 meters. Since environmental factors day to day and varying hosts can have a large effect on meter numbers, the data coming from these videos is kind of unique.

    I've been following the series and associated threads on a couple of other forums and thought my THR brethren might find them interesting.

    .30 Cal cans on an AR-10


    Rimfire cans on .17 HMR


    K-Can performance


    .30 cal cans on .300 blk


    5.56 and .30 cal cans on 11.5" 5.56
     
  2. MachIVshooter

    MachIVshooter Member

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    HB does a lot for helping people see some real-world figures on popular models.

    There are times I think about sending them samples. And Hickok 45. But until I'm set up with CNC, I'm not in a position for demand to explode, so I don't. If I got an order for 100 cans, that'd be 50-60 hours per week for the next 6 months.
     
    Odd Job likes this.
  3. Elkins45

    Elkins45 Member

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    They tested quite a few cans that I would describe as obscure, or at least uncommon.
     
  4. Gtscotty

    Gtscotty Member

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    I'd love to see some of your cans in their their tests! They are basically the only (free) impartial testing source available for ear and muzzle numbers, taken with a mil spec meter.

    Rex Silentium and CGS Group are smaller companies, but most of the companies tested, Silencer Co, Dead Air, YHM, Q, etc are currently big names in the the silencer industry, and Energetic Armament is becoming a pretty well known up and comer.
     
  5. Telekinesis

    Telekinesis Member

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    Take a look at NFATalk - they're a web forum and a few of their guys have good meters and follow mil spec. They also make the raw numbers available so you can see things like average, FRP, and how the levels change as wipes degrade, what hosts and ammo was used, unsuppressed numbers, the whole gambit. There's also a handy comparison document for all of the cans they have tested previously.

    They also have a thread on metering random sounds (car door slamming, action noise, etc) for comparison purposes. And there's a fairly good Form 1/homebuild group on there as well making everything from mortars to reproduction welrods (and metering the welrod - it compares pretty favorably to modern stuff as long as modern wipes are used).
     
  6. Gtscotty

    Gtscotty Member

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    I'm familiar with NFA Talk and the metering data on the site. The last time I looked at it, there hadn't been an update to the official metering data file for almost a year, but the information that is there is interesting. The main limitation of the NFA Talk meter data is the variance in host and metering dates, both of which can have quite an effect on the numbers. One well known suppressor company I've talked to said they have seen meter numbers on the same can and host change 5 dB over the course of a day as environmental factors changed.

    Meter results collected over years on different hosts, are interesting, but not as interesting to me as back to back measurements taken on the same host within a very short timeframe, that's why these videos are unique.

    Speaking of interesting meter results, TFB just published the numbers from a large metering event coordinated by Discreet Ballistics a week or so ago. While the metering was unfortunately mostly limited to a 300 BLK host, pretty much all of the currently popular .30 cal cans were tested.

    https://www.thefirearmblog.com/blog/2019/06/15/massive-metering-day/

    Interestingly two B&K 2209s and a B&K Mini-Pulse were used. The Mini-Pulse picked up peaks that the 2209s missed and a B&K engineer made this short write-up explaining the limitations of the B&K 2209's time weighting that causes them to under report some short duration peaks, as shown in the data set.

    https://www.scribd.com/document/413...ve-Noise?secret_password=lxbbXUH9lPFTofXwTnMT
     
  7. Odd Job

    Odd Job Moderator Staff Member

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    Yep, sound metering is not easy, according to the limited research I have done on it.
    I have a bunch of cans I would like to meter but the cost is going to be prohibitive. Sadly I cannot send these out the country.
    I have an air rifle can that I can send but it falls foul of ATF rules because it can also be used on a .22 LR.

    OP thanks for the links, I will be checking out those videos.
     
  8. Gtscotty

    Gtscotty Member

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    Sixth and last video in this Suppressor Showdown series:

    Variety of cans on 16" 5.56 AR-15.


    It really drives home the need to tune an AR for suppressor use (AGB, Bootleg BCG , ect.) to get the sound levels at the ear down.

    Can't wait for my Nomad to get out of jail, went pending 05/23/19, should be any day now :rofl:
     
    Last edited: Jun 22, 2019
  9. MachIVshooter

    MachIVshooter Member

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    Absolutely. A high backpressure can and a generous gas system will put you well over 140 at ear, no matter what the muzzle position meters. And it's pretty much impossible to get lower than 136-137 unless you run loads that don't cycle the gun. And the Stoner gas system is about the only one that'll render a gas operated semi auto technically hearing safe; op rod semi autos are pretty much gonna be over 140 no matter what you do. My FAL is suppressed, I tuned the gas system to where it just cycles, and you absolutely still need ear pro.

    Another option for gas adjustment if you don't have/don't want a low profile adjustable gas block or really expensive carrier (which is a half-way fix anyway):

    IMG_3267.JPG

    IMG_3273.JPG
     
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