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Frequency (Hz)
125 250 500 1000 2000 3150 4000 6300 8000 NRR CSA
Class
Mean Attenuation (dB)
12.9 23.7 42.2 43.3 43.3
20 dB B
Standard Deviation (dB)
3.0 2.6 2.9 3.6 2.8 4.0 3.8 4.6
Folding headband with gel cushions and foam liners
AS-BH2O-92, AS-MCAS-92 with HY80A
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Frequency (Hz)
125 250 500 1000 2000 3150 4000 6300 8000 NRR CSA
Class
Mean Attenuation (dB)
11.0 12.9 20.3 32.4 37.6 40.1 39.4
17 dB B
Standard Deviation (dB)
3.1 2.4 3.1 3.6 2.4 4.1 3.7 3.3
Folding headband with gel cushions and silicone liners
AS-BH2O-92, AS-MCAS-92 with HY80A
Frequency (Hz)
125 250 500 1000 2000 3150 4000 6300 8000 NRR CSA
Class
Mean Attenuation (dB)
23.7 33.0 42.7 44.4
20 dB B
Standard Deviation (dB)
4.4 2.6 2.9 3.4 3.7 3.2 4.2 2.8 4.4
Backband with gel cushions and foam liners
AS-BH2O-92, AS-MCAS-92 with HY80A
Frequency (Hz)
125 250 500 1000 2000 3150 4000 6300 8000 NRR CSA
Class
Mean Attenuation (dB)
13.7 20.1 29.0 30.1 37.3 39.6 40.4 39.8
17 dB B
Standard Deviation (dB)
4.0 1.8 3.0 3.3 4.4 3.6 4.4 3.4
Backband with gel cushions and silicone liners
AS-BH2O-92, AS-MCAS-92 with HY80A
Frequency (Hz)
125 250 500 1000 2000 3150 4000 6300 8000 NRR CSA
Class
Mean Attenuation (dB)
11.8 14.4 21.4 33.1 36.0 44.1
18 dB B
Standard Deviation (dB)
3.8 3.1 3.6 3.7 4.2 3.1 6.1 7.7
Helmet attachment* with gel cushions and foam liners
AS-BH2O-92, AS-MCAS-92 with HY80A
Frequency (Hz)
125 250 500 1000 2000 3150 4000 6300 8000 NRR CSA
Class
Mean Attenuation (dB)
11.7 11.6 17.7 28.2 30.1 37.8 39.8 42.1 40.1
14 dB B
Standard Deviation (dB)
3.9 2.6 4.2 4.0 3.7 3.4 2.9 2.4
Helmet attachment* with gel cushions and silicone liners
AS-BH2O-92, AS-MCAS-92 with HY80A
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