Which loudspeakers do audio professionals listen to? And why should we care? After all, it's not as if recording engineers are the kind of refined, sensitive, music-loving types who read Stereophile. As much as they may love music, many audio pros appear only to view the original sounds of musical instruments as raw materials to be creatively reshaped and manipulated. (Okay, there are exceptions. But recordists who care about the sounds of real instruments usually record them in real acoustic spaces rather than in studios, and use as little signal processing as they can get away with.)

It's been a long time since we've seen a really new tweeter design. Only five basic types have ever been developed: cones, domes, panels, ribbons, and ionic plasmas. And the most recent of these—the long-defunct DuKane "blue-glow" Ionovac—was introduced 40 years ago. Since then, tweeter development has been more evolutionary than revolutionary, a series of refinements that has made them more efficient, more reliable, and smoother and more extended in response.

Stereophile’s moment-to-moment coverage of the largest audio show in North America is about to begin.