I know this may appear to be a smart ass comment... and I regret that. A couple of weeks ago, the local university's junior orchestra set up in my high school's cafeteria/stage and gave several recitals. I felt the vibrations before I walked in. The group was miked-up and amped out. Perhaps that's still the ultimate amp set up. Re: headamp. My gut's telling me that Senheisser's Orpheus monster is the uber-amp. I wonder what unusual chipsets and wiring choices are under that shiny amp?