Imagine listening to music through a speaker that is the equivalent of a sonic electron microscope—reproducing detail in a recording on what seems to be a molecular level (if sound can be imagined to exist in material form) and yet painting an aural wall-to-wall picture as if with a one-haired sable brush. The Eclipse TD712zMk2 ($10,600 per pair), a product of the Japanese firm Fujitsu Ten, is such a device—as much a scientific instrument as a component in the chain of gear that constitutes a state-of-the-art …