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Model 27 | ||
The David Clark Company Model 27 Combines Comfort Durability and Quality construction with Superior Low frequency noise attenuation. | ||
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NRR
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NOISE ATTENUATION DATA - MODEL 27 | |||||||||
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Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 3150 | 4000 | 6300 | 8000 | |
Attenuation (dB) | 22.9 | 26.4 | 26.1 | 31.0 | 31.5 | 33.6 | 35.5 | 35.8 | 35.8 | |
Standard Deviation | 3.8 | 3.5 | 3.7 | 3.7 | 3.3 | 4.2 | 4.7 | 4.9 | 4.3 |