Actually K271 are hugely improved by amping. Read my recent thread, with a tube amplifier I felt like being in a music hall. I can hear the breathing of the players and sound of their chairs and the pages being turned over. Awsome!
I bought an ASL MKII amplifier from him. Very good communication, excellent support and he taught me a lot of things about tube amplifiers. The shipping was really fast and very well packaged. I highly recommend dealing with him.