Model H3312 - Noise attenuating headset
Enlarge image- M-1/DC Noise Canceling Amplified Dynamic Microphone
- Noise Shielded Microphone(Muff) with Momentary PTT(Push-to-Talk) switch, hangs freely ready for periodic use.
- Soft Headpad and Ear Seals guarantee exceptional comfort.
- 25 foot straight cord with (PJ-051) Plug to mate with Series C31-XX Extension Cords
- Corrosion-proof, chrome plated Headset/Stirrup Assembly
- Certified Noise Reduction Rating of 26db
View a PDF file of model H3312 parts list and schematics
Noise attenuation data
| Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 3000 | 4000 | 6000 | 8000 |
| Attenuation (dB) | 22.4 | 25.5 | 30.3 | 33.3 | 34.1 | 39.3 | 39.9 | 38.7 | 38.3 |
| Standard Deviation | 3.2 | 3.2 | 3.0 | 2.2 | 2.5 | 2.6 | 2.4 | 2.5 | 3.5 |
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(source: http://www.davidclark.com/)