Sennheiser came into existence just a few weeks after the end of World War II. Guess where? Germany. That's right. There's something to be said about how Germans seem to always hit the nail right on the head when it comes to audio. Sennheiser was the first to introduce open back headphones in the late sixties. The greatest headphones known to mankind - the Sennheiser Orpheus
headphones were released in 1991, and came with a tube amplifier for added volume and sound quality.