Approved, recommended and used extensively by the United States Air Force since 1994. The Sound Shield is the highest rated three-position earmuff you can buy. Tested at the NVLAP Accredited laboratory of Michael & Associates in State College, Pennsylvania. |
- Model #2900
- The only 29 NRR earmuff made in the USA
- Outstanding low frequency performance
- Soft-Seal™ ear cushions provide exceptional comfort and fit
- Low standard deviations indicate a consistent fit
- Sculpted headband has molded grips for easy cup adjustment
- Super-soft head pad is easily replaceable
- Dielectric, three position muff available in charcoal gray, or high visibility red
Attenuation data
| Over-the-Head |
Frequency in Hz |
125 |
250 |
500 |
1000 |
2000 |
3150 |
4000 |
6300 |
8000 |
Mean (dB) Attenuation |
19.0 |
25.6 |
36.6 |
43.2 |
36.5 |
35.1 |
36.9 |
36.6 |
36.4 |
Standard Deviation |
2.0 |
2.1 |
2.2 |
2.7 |
2.0 |
2.0 |
1.9 |
2.1 |
1.9 |
NRR=29dB |
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| Behind-the-Head |
Frequency in Hz |
125 |
250 |
500 |
1000 |
2000 |
3150 |
4000 |
6300 |
8000 |
Mean (dB) Attenuation |
19.6 |
26.1 |
36.0 |
41.7 |
37.2 |
36.9 |
38.3 |
36.3 |
37.0 |
Standard Deviation |
2.5 |
2.6 |
18. |
2.6 |
3.4 |
3.8 |
2.2 |
2.3 |
3.0 |
NRR=28dB |
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| Under-the-Chin |
Frequency in Hz |
125 |
250 |
500 |
1000 |
2000 |
3150 |
4000 |
6300 |
8000 |
Mean (dB) Attenuation |
19.5 |
26.8 |
35.7 |
41.9 |
36.7 |
35.9 |
37.9 |
36.2 |
36.3 |
Standard Deviation |
2.8 |
2.8 |
2.4 |
3.1 |
2.7 |
3.1 |
2.6 |
3.1 |
2.6 |
NRR=28dB |
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