Yamaha SOAVO-900SWBH Advanced YST II Front Firing Subwoofer ( Natural Birch) (Discontinued by Manufacturer) New 10" F.B.P. (Fiber Blend Paper) diaphragm with diecast aluminum frame and 600W high performance digital amplifier built in Birch veneer cabinet with open-pore finish Full-function remote control unit Three memory presets Frequency Response 18 Hz - 160 Hz