MartinLogan Motif High-Performance Electrostatic Speaker (Single, Center Channel, Dark Cherry) (Discontinued by Manufacturer) MartinLogan high-performance hybrid electrostatic center channel loudspeaker CLS electrostatic transducer - the world's most accurate transducer technology Two 5.25-inch high-resolution neodymium aluminum cone woofers Frequency response: 73-20,000 Hz Easy to power with modest priced receivers, yet competely at home with higher performance electronics