Price Match Guarantee Yamaha NS-SW100BL 10" 100W Powered Subwoofer (Black) This subwoofer incorporates a number of Yamaha advanced, high-performance bass technologies, such as Twisted Flare Port, Advanced YST II (Yamaha Active Servo Technology II) with discrete amp circuitry and a high-quality 10" woofer unit. The resulting bass response is powerfully rich and impactful. Product Highlights: New twisted flare port contributes to clear and tight bass Advanced YST II (Yamaha Active Servo Technology II) 10" cone woofer Stylish addition to any room Our 30-day money back guarantee MFR # NS-SW100BL