Final sound has decided to develop their own subwoofers, thus assuring the best integration with their electrostatic panels. There are two different models, covering the needs and demands form the smallest entry level, to the reference series. The s110 is custom tailored for perfect integration with 901, 150i and 300i. The prescription for matching was musicality and extreme speed and tightness, resulting in a bass module with perfect integration, offering great musical joy.