MartinLogan Source High-Performance Electrostatic Loudspeaker (Single, Black) (Discontinued by Manufacturer) MartinLogan high quality, full range speaker with adjustable base Equipped with CLS Generation 2 electrostatic panel Frequency response: 4222,000 Hz Equipped with a high-resolution 8-inch woofers Easy to power with modest priced receivers, yet competely at home with higher performance electronics