This yamaha NS-sw050 Subwoofer features Yamaha’s advanced and powerful bass technologies such as Twisted Flare Port and Advanced YST II (Yamaha Active Servo Technology II) with discrete amplifier circuitry and a high-quality 20 cm (8″) woofer unit. It incorporates a number of: Sensational bass response for enhanced listening enjoyment Enhanced overall performance for music and movies New Twisted Flare port contributes to clear and tight bass Advanced YST II (Yamaha Active Servo Technology II) 20 cm (8″) cone woofer   this will also add style to any room. The company has been focusing on building up new and better 100 Watt Active subwoofers at an affordable price. These subwoofers are actually made for one who loves to hear the real bass of the music.