12
Earmuffs
Frequency (HZ)
125
250
500
1000
2000
3150
4000
6300
8000
Mean Attenuation (dB)
18.0
18.9
25.0
30.0
32.1
37.9
37.9
36.8
34.1
Standard Deviation (dB)
2.9
1.7
1.7
2.0
2.3
2.9
3.5
3.3
4.1
NRR=23 dB; Headband Force=2.7 lbs.
PER ANSI S3.19-1974
TEST REPORT ID: Q5342A, Michael and Associates, Inc.
Important:
NRR is not attenuation, and the labeled NRR for most earmuffs does not represent
typical performance. While the labeled NRR is 23 dB, the typical user can expect to obtain a
higher level of attenuation across frequencies when the ear muffs are used as directed and the
device is off.
NRR (Noise Reduction Rating)
