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The Yamaha NS-SP1800 5.1-channel speaker package offers authentic audio quality. Yamaha NS-SP1800 includes a powerful 100-watt subwoofer for full surround home theater enjoyment. This affordable speaker system features Advanced YST (Yamaha Active Servo) Technology--a unique system in which the speaker and amplifier work together to cancel out impedance to ensure the highest levels of sound pressure and overall performance. This outstanding system also features wide-range system frequency response, and magnetic shielding on the front and center speakers. And it's wall-mountable for placement convenience. Enjoy authentic sound quality with the Yamaha NS-SP1800 Natural Sound 5.1-channel speaker package.