Thread replies: 15
Thread images: 2
Thread images: 2
Anonymous
Firearms rookie question 2017-05-06 01:30:25 Post No. 33872349
[Report] Image search: [Google]
Firearms rookie question 2017-05-06 01:30:25 Post No. 33872349
[Report] Image search: [Google]
File: IMG_7188.jpg (44KB, 493x697px) Image search:
[Google]
44KB, 493x697px
If I buy a set of electronic earplugs like the expensive ESP ones which have an NRR (noise reduction rating) of 25. Does that mean the actual decibel reduction is (25-7)/2 = 9DB? If so, then how on earth is it safe to fire a shotgun which produces let's say 160DB if these earplugs only offer 9DB reduction. Even by doubling up, with this calculation it would reduce approx. 16DB which would still be 144DB and would hurt like shit. I'm probably misinterpreting something but can someone elaborate?
>>
>>33872349
That's not how NRR works.
>>
>>33872380
Alright, but then how does it work?
>>
>>33872349
>(25-7)/2 = 9DB?
Fucking what? Also, regular foam ones do better than that. Much better.
>>
>>33872454
https://trevoronthetrigger.wordpress.com/2014/05/01/msa-sordin-supreme-performance-the-misleading-nrr18db-rating/
>>
>>33872349
>which produces let's say 160DB
That's in front of the muzzle. Due to the doppler effect, you receive much less than that.
>>
>>33872489
No.
>>
File: 1432761196437.png (74KB, 761x576px) Image search:
[Google]
74KB, 761x576px
>>33872518
>No.
Yes.
>>
>>33872528
No.
>>
>>33872537
Do you not know what the doppler effect is?
>>
>>33872548
Yeah.
Irrelevant.
>>
>>33872548
I may be wrong but dappled effect only has an effect on frequency not intensity.
>>
>>33872548
static explosion, dynamic bullet.
Most of the noise is the explosion.
>>
>>33872489
>>33872548
sound does reduce over distance but it ain't the doppler effect
http://www.sengpielaudio.com/calculator-distance.htm
>>
>>33872480
informative, thanks homie
Thread posts: 15
Thread images: 2
Thread images: 2