This Package IncludesNS-SW100 SubwooferNS-C210 Center Channel SpeakerNS-SW100 SubwooferThis 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.FeaturesNew Twisted Flare Port for clear and tight bassAdvanced YST II10" cone wooferFrequency response: 25Hz - 180HzDimensions (W x H x D): 13 7/8" x 13 7/8" x 16 1/8"Clear Tight BassThe 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 IIDeveloped 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 SpeakerDesigned 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.FeaturesOptimized for HD Movie & Music SoundDual Aluminum Cone Woofers7/8" Balanced Dome TweeterSlim Center-Channel DesignFast Clean Bass ResponseDual woofers use lightweight aluminum cones for extra-fast response helping produce tighter more detailed bass and better impact for movie soundtracks and