Electrostatic Speaker designs use a high-voltage electric field to vibrate a thin membrane between two perforated conductive plates called stators. Unless paired with a hybrid design, using dynamic woofers (as MartinLogan speakers do), electrostatics don't need a crossover system the way traditional dynamic loudspeaker systems do.
Electrostatic speakers are best known for their "big" sound, most often referred to as a "wall of sound." They can be hard to drive, and are best matched with a high powered amplifier. Even the largest electrostatic speakers don't excel at bass reproduction, so all are best paired with a good subwoofer.
HomeTheaterReview.com's reviews of electrostatic loudspeakers include: