Sony SA-EX100 active speaker system, in excellent condition. A rare and advanced active model from Sony, famous for combining a Motion Feedback (MFB) woofer with a high-end electrostatic tweeter in a bi-amplified design. The SA-EX100 features two built-in amplifiers per cabinet (bi-amplification) to power the woofer and electrostatic tweeter independently. Its active Motion Feedback system constantly monitors and corrects woofer movement to eliminate distortion, delivering exceptionally tight, clean bass. The electrostatic tweeter provides an remarkably airy, detailed, and spatial high-frequency response rarely found in speakers of this size. Easily connected to any preamplifier, network streamer, or Bluetooth adapter via standard audio inputs. Technically and optically in excellent condition, ready for years of enjoyment. Specifications Type: active 2-way bi-amplified speaker system System: bi-amplifier (separate internal amplifiers for woofer and tweeter) Woofer amplifier power: 50 Watts RMS Tweeter amplifier power: 8 Watts RMS Frequency response: 40 Hz - 20,000 Hz Woofer: 15 cm cone with Motion Feedback (MFB) Tweeter: 2.5 x 10 cm electrostatic tweeter Crossover frequency: 3,000 Hz Power consumption: 60 Watts per unit Inputs: RCA audio input Dimensions (W x H x D): 22 x 45.5 x 35 cm Weight: approx. 8.2 kg per speaker Design: Sony Corporation (Japan) A unique piece of Japanese audio engineering that blends bi-amplified drive, MFB bass accuracy, and electrostatic highs into a compact, standout active speaker system.