http://www.lockergnome.com/media/2011/08/30/which-are-better-electrostatic-or-driver-speakers/
There are two different types of speakers, electrostatic and driver. They sound alike, they look alike, at times they even walk alike. Well, they don't walk, but you get the idea. These are two different technologies that help recreate sound.
In this video, LockerGnome's Brandon Wirtz breaks down the differences between driver and electrostatic speakers, and why they are both great solutions for various applications.