This Package Includes NS-SW100 Subwoofer NS-C210 Center Channel Speaker NS-SW100 Subwoofer This subwoofer incorporates a number of Yamaha's advanced features and high performance bass technologies such as Twisted Flare Port and Advanced YST II (Yamaha Active Servo Technology II) with discrete amp circuitry and high quality (10") woofer unit. This results in sensational bass response that adds significantly to overall listening enjoyment of music and movies. Features New Twisted Flare Port for clear and tight bass Advanced YST II 10" cone woofer Frequency response: 25Hz - 180Hz Dimensions (W x H x D): 13 7/8" x 13 7/8" x 16 1/8" Clear, Tight Bass The flared, gently twisting shape diffuses the vortex of air generated around the edge of the port, creating a smooth flow of air. This reduces extraneous noise not present in the original input signal and provides clear, accurate low frequency reproduction. From special effects sounds in movies, to the atmosphere of a live venue, you hear bass that is clear, tight, and realistic. Advanced YST II Developed by Yamaha, the Advanced YST II (Yamaha Active Servo Technology II) combines negative-impedance and constant current principles to drive the speaker cone with even tighter control than the previous version. Using Advanced Negative Impedance Converter (ANIC) circuits, this system dynamically optimizes effective speaker impedance to maintain excellent linearity. This means more stable and accurate low range response, not to mention higher sound quality. NS-C210 Center Channel Speaker Designed to maximize the potential of HD sound sources, the Yamaha NS-C210 delivers clear, dynamic sound that makes dialogue and effects more lifelike in your home theater. Features Optimized for HD Movie & Music Sound Dual Aluminum Cone Woofers 7/8" Balanced Dome Tweeter Slim Center-Channel Design Fast, Clean Bass Response Dual woofers use lightweight aluminum cones for extra-fast response, helping produce tighter, more detailed bass and better impact for movie soundtracks and music. Balanced Dome Tweeter for Detail A 7/8" balanced dome tweeter helps reproduce crisp highs and clarity, improving vocal intelligibility and enhancing overall soundstage detail. Slim, TV-Friendly Design + Premium Finish The NS-C210’s slim profile pairs cleanly with modern flat-panel TVs, and the Yamaha Piano Black finish gives it a sleek, high-end look that blends into most home theater setups.