Posted by Dinah on July 5, 2013, at 8:42:14
In reply to Re: can't take it anymore, posted by Dinah on July 5, 2013, at 8:06:31
The passive ones don't use the counter-noise. The counter-noise really does work best on things like airplane noise.
http://electronics.howstuffworks.com/gadgets/audio-music/noise-canceling-headphone3.htm
It won't block all sound, but it will muffle it.
poster:Dinah
thread:1046412
URL: http://www.dr-bob.org/babble/psycho/20130309/msgs/1046516.html