This year at CES -- as always -- there's been waves and waves of new technology. Not everything of interest is always white hot, though. We're talking about the above pair of headphones -- the Orpheus HE90 from Sennheiser. Those in the know will be somewhat familiar with these headphones, as they made their initial debut in 1991. Yeah, 1991. The limited run of 300 pairs has secured these exclusive cans a special place in audio folklore. The electrostatic headphones combined with a companion all-valve amp are what many consider to be a reference point in hi-fi. As a small example, most consumer headphones offer a frequency response somewhere in the region of 60 - 20,000 kHz. The Orpheus offer from 7 - 100,000 -- we're guessing even som
