EssenceElectrostatic.com
"The top-of-the-line model is called the AirPulse A300. It sells for $1099 a pair with free shipping in the USA (lower 48). It features the Phil Jones Signature 6.5″ woofer. This driver is made of hard-anodized aluminum combined with an under-hung, edge-wound voice coil, fully immersed within the neodymium magnetic field. Other speaker manufactures use cheaper magnets with over-hung voice coils which increase distortion and limit SPL."