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Yamahas Advanced Active Servo Technology Is A Complementary Amplifier/speaker System Utilizing Negative Impedance Feedback In The Amp And A Helmholtz Resonator In The Speaker To Provide Strong And Accurate Bass. High Amplifier Power Assures Enough Power To Deliver Shattering Movie Theater-like Bass Effects, And The Down Firing 10 Long Stroke Cone Driver Translates The Power Into Clear Bass Sound. The Pwm Digital Drive Amplifier Is Extremely Efficient And Stable. The Yst-sw315 Has A Frequency Range Of 20 To 160 Hz. Yamahas Bass (bass Action Selector Switch) Tailors The Subs Output For Video Or Music At The Touch Of A Switch. A Yamaha Technology That Uses A Down Firing Driver To Radiate The Bass Output More Efficiently. Sound Is Radiated In All Directions For Greater Impact. The Subwoofer Is Magnetically Shielded So It Can Be Placed Near A TV Monitor Or Receiver Without Degrading The Picture. The User Adjustable Continuously Variable High-cut Filter Sets The Highest Frequency The Subwoofer Will Deliver. It Can Be Set Anywhere From 40 To 140 Hz. For Instance, If The Filter Is Set At 75 Hz, Only Frequencies 75 Hz Or Below Will Be Delivered By The Subwoofer. This Allows The Subs Output To Be Matched To The Other Speakers In The System And The Room's Acoustics For A Seamless Presentation.