MAC meters the new OSS can

[mig1nc]

Interesting results: https://www.youtube.com/watch?v=cY1r5a_SZBc

Nevertheless, I'm still fascinated by the design.

[BigWaylon]

MAC uses a meter that doesn't meet milspec. No point in watching the videos for anything other than entertainment value.

[lee1000]

MAC uses a meter that doesn't meet milspec. No point in watching the videos for anything other than entertainment value.

I would imagine they are good relative measurements though.

I wonder how much the ejection chute muffles the sound at the shooters ear. He should have used something like a AR10.

[BigWaylon]

I would imagine they are good relative measurements though.

I wonder how much the ejection chute muffles the sound at the shooters ear. He should have used something like a AR10.

They're not "good". That's the whole issue.

We've had this discussion over on ARF 2-3 times in the last month, with a lot of really good technical discussion and many industry experts taking part. I can link the threads if anybody wants to read through them.

[lee1000]

They're not "good". That's the whole issue.

We've had this discussion over on ARF 2-3 times in the last month, with a lot of really good technical discussion and many industry experts taking part. I can link the threads if anybody wants to read through them.

But they are relative measurements. Maybe not actual but they are relative to other measuments using the same equipment and to other suppressors.

[BigWaylon]

But they are relative measurements. Maybe not actual but they are relative to other measuments using the same equipment and to other suppressors.

They're actually not. The issue is the sampling rate isn't fast enough. So it might catch it on the upslope for one shot, the peak for another, and the down slope for a third. Not a case of "just add 3dB and it'll be right"...or "even though it's not the right number, it still indicates which one is quieter/louder". The readings are inaccurate at a random rate. It's inconsistently inconsistent.

This is truly a case of some data being worse than no data.

[SteyrAUG]

But they are relative measurements. Maybe not actual but they are relative to other measuments using the same equipment and to other suppressors.

Actually not really. I once had some of the folks at Gemtech explain to me all of the variable required for meaningful data and it was pretty astonishing. On other occasions I watched another company rep demonstrate how he could get completely different results with the same rifle / suppressor combination using the same meter and how those results can easily be skewed if they aren't taken under the proper conditions.

Bottom line is anything "outdoors" is almost meaningless.

This is one reason Gemtech stopped advertising db levels because it was so easy to obtain better db levels by not adhering to the same environmental conditions, and of course that is what their competitors did.

[mig1nc]

True, but what's really interesting with these cans is the difference between at the ear and at the muzzle.

That much is actually illustrated in the video reasonably well.

Check it out, it's a fun watch anyway.

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[BigWaylon]

True, but what's really interesting with these cans is the difference between at the ear and at the muzzle.

That much is actually illustrated in the video reasonably well.

Check it out, it's a fun watch anyway.

I watch a lot of his stuff, and enjoy it.

But bad data is bad data. It's not accurate measurements at either location, so the real life numbers could be opposite of what you see (as far as ear vs muzzle).

[mig1nc]

I don't doubt any of that. I understand sampling. I get what you are saying. I live that world.

That said, it is worth noting that his readings at any given point were very close to each other taking 5 samples at any point. Not all over the place.

I'm not defending his equipment. It is what it is. But I don't think there data should be completely dismissed out of hand. You have to be sure and understand that the sample rate isn't high enough be sure to catch the peak. But in this case it is extremely consistent in each test, which does speak to a certain extent.





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