All in all, my first impression is that the MartinLogan Motion 40 is a tremendous tease. The Folded Motion tweeter takes you almost to the point of electrostatic magic but stops just short of three-dimensionality. On the other hand, the Motion 40s are easier to integrate into a room than a typical electrostatic speaker, so I think it’s a pretty equitable tradeoff. By the time you read this, MartinLogan will probably have announced new Motion Series surrounds and center channel to match with the Motion 20s and Motion 40s. We’ll be testing them as soon as they’re available and reporting on the full system at that time, complete with measurements and updated ratings. But if they all perform as well together as the Motion 40s do by themselves, it ought to make one killer non-electrostatic system.
http://www.hometheater.com/content/martinlogan-motion-40-loudspeaker