David Clark H20-10X as spare part, battery case and connecton cable missing!
Product no.: 10140
Description
New active Stereo - Headset with soft tended boom, noise attenuating electret microphon, flexible boom, mic to be weared on either side!
The battery box and the connection cable are missing.
Comfortable to wear with 20 oz.
easy to customize by a raster on the headband.
Soft gel filled ear seals for best comfort!
New foam wind shed on the high-end electret microphone.
This headset is equipped with ANR, i.e. Active Noise Reduction. This works as described here:
Active noise-canceling headphones can do everything that passive ones can do!
Plus they also add an extra level of noise reduction by actively erasing lower-frequency sound waves.
How do noise-canceling headphones accomplish this?
They actually create their own sound waves that mimic the incoming noise in every respect except one: the headphone's sound waves are 180 degrees out of phase with the intruding waves.
By erasing the disturbing ambient sound you experience silence at a level that you would not have expected!