Yamaha YST-FSW150BL Advanced YST II Down-Firing Active Subwoofer is a new shaped subwoofer with Yamaha"s latest technologies, including Advanced YST II, Linear Port and down-firing Active design plus. The Rack Mountable Design matches the surround systems and micro component systems. This subwoofer both employs a high performance and down-firing active design. Even though compact, it delivers an impressive bass power and accurate sound reproduction. The down-firing design radiates the sound efficiently in all directions. The Linear Port provides smooth bass response and minimizes extraneous noise. It also serves to boost the sound output from this compact subwoofer. Capable of handling high dynamic power of 130W, this subwoofer ensures that you hear all bass sounds, even the loudest short bursts, with fast attack and total clarity.