Well, I didn't want to link to Wikipedia in my answer, but here you are: http://en.wikipedia.org/wiki/Stereophonic_sound http://en.wikipedia.org/wiki/Stereopho

Well, I didn't want to link to Wikipedia in my answer, but here you are: http://en.wikipedia.org/wiki/Stereophonic_sound http://en.wikipedia.org/wiki/Stereophonic_sound Everything is here: from history to how it works. I hope this gets you satisfied! And btw, I also check which one is the correct... and in my brand new Sennheiser, it is pretty hard to find where it is engraved!