Originally Posted by theatomizer90
So i just looked at the sony headphones and i have a question about active noise cancelling. Does it cause pressure or a simmilar feeling?
The Sony MDR-10R is available with and without active noise cancellation,and even on the units with ANC, you can simply turn it off.
But, to answer your question, ANC uses a microphone to sense the ambient noise outside the headphone. A circuit then attempts to create an equivalent sound that is 180 degrees out of phase with the ambient noise. This cancels the noise sound waves before they hit your eardrum. Of course, the cancellation isn't perfect, and this will cause a low hiss to be heard in the headphones when the music is not playing. Depending on the details of the ANC circuit, it can also change the character of the music your hear. In theory, since sound is simply a pressure change detected by your eardrum, then if the ANC means you hear less noise, that also means there is *less* pressure change being detected by your eardrum.