

| The Model H10-56, designed specifically for helicopter use, has the best noise attenuation with a Certified Noise Reduction Rating of 27 dB. |
|
NRR | NOISE ATTENUATION DATA - MODELS H10-56 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 3000 | 4000 | 6000 | 8000 | |
| Attenuation (dB) | 17.6 | 25.0 | 30.9 | 33.9 | 36.9 | 38.4 | 39.0 | 37.7 | 35.7 | |
| Standard Deviation | 1.9 | 3.0 | 2.2 | 1.3 | 1.5 | 2.1 | 2.1 | 2.5 | 2.2 | |
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