Yamaha NS-SP1800 5.1-Channel Home-Theater Speaker System
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NS-SP1800 Multimedia Home Theater Speaker System is an entry-class speakerpackage that allows you to conveniently enjoy the full benefits of 5.1 sound. It has Advanced Yamaha Active Servo Technology (Advanced YST), this is a unique system in which the speaker and Amplifier work together to cancel out impedance so the speaker unit has a perfectly linear motion. Advanced YST helps to ensure the highest levels of sound pressure and overall performance.
Yamaha NS-SP1800 5.1-Channel Home-Theater Speaker System