I saw this on Enjoy the Music.com, and thought it was interesting. I wonder what it will do for speaker manufacturing:

A new book titled Current-Driving of Loudspeakers by Esa Meriläinen ($27.76) demonstrates new process for loudspeaker feeding. Meriläinen argues that conventional loudspeaker technology is flawed and introduces a new method for loudspeaker feeding called current-drive. According to Meriläinen, all audio power amplifiers in use today deliver voltage signals despite the fact that electrodynamic speakers respond only to current. Meriläinen argues that virtually all speaker systems have been severely impaired by the diverse electromotive forces induced in the voice coil that corrupt the flow of current. In response, he has developed new design practices and example circuits to operate the loudspeaker by controlled current, eliminating major distortion factors and offering what he feels is a superior listening experience. "Why have the basic laws of electrodynamics been ignored in the design of all loudspeaker operations?" Esa Meriläinen asks. "These design flaws affect the quality of all sound produced by loudspeakers everywhere and therefore perhaps even the musical preferences and choices of our entire culture." In addition to new concepts for amplifier and speaker design and demonstrative projects, the book also features ideas for modeling, filter design, measurements, and protection and provides a useful tutorial on analog linear systems. It can be purchased from Amazon.com at this link.