David Clark MODEL H6040 Behind the Head Style (BTH)
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30 in. straight cord
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BTH style for applications requiring hard hats or protective headgear
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Flex boom for easy, precise microphone placement
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Foam-filled ear seals for maximum comfort
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Noise Reduction Rating (NRR): 23 dB
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Noise-shielded M-77 electret microphone for clear communication
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Rugged construction
Noise Attenuation Data
NRR
23 dB Frequency (Hz) 125 250 500 1000 2000 3150 4000 6300 8000
Attenuation (dB) 14.1 21.9 29.4 32.0 29.7 35.2 36.2 38.1 37.4
Standard Deviation 2.5 2.5 3.0 2.7 2.2 1.7 2.5 2.9 2.8