Funcionando.Yamaha SW P270 subwoofer Advanced YSTAdvanced Yamaha Active Servo Technology (Advanced YST) 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.Driver 16cm coneDynamic Power 100 WDimensions (W x H x D) 200 x 365 x 370 mmWeight 8.5 kg