The all-new Twisted Flare Port bass reflex port is the result of Yamaha's long experience in developing acoustic technologies and excellent subwoofers. The fluted, slightly twisted shape dissolves swirls of air at the edges of the opening and ensures a much more harmonious air flow. This attenuates noises that are not part of the original sound and ensures precise and exact reproduction. From cinema-ready special effects to the typical atmosphere of exciting live broadcasts - the innovative technology always ensures crisp, dry and realistic bass reproduction. Yamaha's exclusive Advanced Active Servo Technology II (Advanced YSTII) tickles extreme powerful and crisp bass from small speaker cabinets. By utilizing negative impedance generation, Advanced YST II is the ideal way to combine amplifiers and subwoofers for maximum bass performance. The unobtrusive design makes the subwoofer look good in the living room or home cinema. The subwoofer is available in black and white so it can be selected as your speakers.