When I told my friends that I had bought a somewhat expensive amp for Headphone listening, and that it had cost more than twice the price of my headphones, they looked at me as if I was sick or confused! But I keep thinking (after a full year of listening) that it is one piece of equipment that I could very well keep for a loooong time! My purchase began when I saw it at a local distributor for Sennheiser.  Two months before I had bought my Shure SRH-940's to replace my old Sennheiser HD-280Pro, which had more than 7 years of use.  Reading in...