Hertz Ml 1650.3-165 Mm Woofer Size mm (in.) 165 (6.5) Power Handling - Peak W 250 | Power Handling - Continuous W 125 Impedance  4 | Frequency response Hz 40 - 6.5k Sensitivity dB SPL 93 | Voice coil  mm (in.) 36 (1.4) Magnet Neodymium | Cone/Dome Pressed-pulp cone with cotton fibres