NS-SW300 A design combining superior operability and beauty. And introducing a new technology, Twisted Flare Port, for clear and tight bass. A subwoofer that will match a wide range of speakers and interiors. Features: PWM digital drive high efficiency amplifier and dual feedback circuit New Twisted Flare Port contributes to clear and tight bass Advanced YST II (Yamaha Active Servo Technology II) 25 cm (10”) cone woofer with square wire voice coil Beautiful design will match a wide range of speakers and interiors Front control panel for easy control System control and Auto standby Specifications: Driver 25 cm (10”) cone Output Power 250 W Frequency Response 20–160 Hz Advanced YST Yes High-Efficiency Power Amplifier Yes Twisted Flare Port Yes BASS (Bass Action Selector System) Yes Auto Standby Yes Standby Power Consumption 0.3 W System Connector Yes Dimensions (W x H x D) 350 x 366 x 420 mm; 13-3/4” x 14-3/8” x 16-1/2” Weight 18 kg; 39.7 lbs.