David Clark MODEL H3442 Behind-the-Head Style (BTH)
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6 ft. coil cord
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Boom rotates 200° for left or right placement
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BTH style for applications requiring hard hats or protective headgear
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Contoured, undercut ‘Comfort-Gel’ ear seals for maximum comfort
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Flex-wire boom for easy, ‘one touch’ microphone placement
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Microphone on/off button
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Noise Reduction Rating (NRR): 23 dB
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Noise-Cancelling M-7A amplified electret microphone
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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 21.1 31 37.1 33 35.6 35.6 38 36.5
Standard Deviation 2.7 2.7 2.8 2.7 3.3 3.5 3.2 2.9 3.4