YAMAHA | 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. | - | - 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 | _ New Twisted Flare Port Produces Clear and Tight Bass | The all-new Twisted Flare Port takes advantage of extensive subwoofer development experience. | The flared, gently twisting shape diffuses the vortex of air generated around the edge of the port, creating a smoothflow of air. | This reduces extraneous noise not present in the originalinput signal and provides clear, accurate low frequency reproduction. | From special effect sounds in movies to the atmosphere ofa live venue, you hear bass that is clear, tight and realistic _ _ _ PWM Digital Drive High Efficiency Amplifier and Dual Feedback Circuit | The built-in power amplifier delivers stable power output of 250 W with high efficiency while minimizing power consumption and heat production. | It does not require an output filter coil, resulting inextremely low noise and distortion. | High speed transient response is also excellent. | The dual feedback circuit reduces distortion by applying feedback twice, resulting in higher sound clarity. _ Advanced YST II for Awesome Deep Bass Developed 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