Originating directly from the experience of the Thesis line components, the Voce woofer features an aluminium basket with a great aerodynamic structure, a cotton-fibre paper pressed cone with Light Damping treatment, a Triple Wave surround in butyl rubber and extremely light Copper Clad Aluminium Wire coils. Comp Woofer Size 165 mm (6-in) Power Handling 100 W Continuous Power 200 W Peak Power Impedance 4 Ohms Frequency Response 50 - 7k Hz Sensitivity 91 dB/Spl Magnet High density flux ferrite Dome Cotton-Fibre pressed paper with Light Damping treatment Mounting Depth 69mm / 2-11/16-in Mounting Hole 146mm / 5-3/4-in