Sennheiser has a thing for trotting out titillating new wares at the annual Consumer Electronics Show, and this year is proving to be no different in that regard. The audio specialist has just introduced one of the most fully-featured headsets we've seen in quite awhile, with the CXC 700 boasting not one, not two, but three levels of noise cancellation. The newfangled NoiseGard /digital technology gives owners a trifecta of noise-cancelling profiles, with each one optimized for something different. In fact,
