Over-the-Head Style (OTH)
- Noise-Cancelling M-7A amplified electret microphone
- BTH style for applications requiring hard hats or protective headgear
- Flex-wire boom for easy, 'one touch' microphone placement
- Boom rotates 200° for left or right placement
- Contoured, undercut 'Comfort-Gel' ear seals for maximum comfort
- Rugged construction
- 36" straight cord
- Noise Reduction Rating (NRR): 23 dB
NRR | NOISE ATTENUATION DATA - MODEL H3430 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 3000 | 4000 | 6000 | 8000 | |
| Attenuation (dB) | 16.6 | 20.7 | 27.4 | 33 | 30.5 | 36.2 | 38.1 | 36.6 | 36.6 | |
| Standard Deviation | 2.6 | 2.5 | 2.5 | 2.6 | 3.1 | 3.5 | 3.7 | 3.7 | 3.6 | |
