SB ACOUSTICS SATORI MW16TX-4, 17cm TEXTREME CONE NEODYMIUM WOOFER 4OHMFeatures Advanced TeXtreme® cone Vented aerodynamic cast aluminium chassis Soft low damping rubber surround Advanced BIMAX spider Powerful optimized low distortion neodymium motor system Extended copper sleeve on pole piece Non-conducting fiberglass voice coil former Vented pole piece and voice coil Light weight CCAW voice coil Long life silver lead wires Specs Nominal Impedance 4 Ω DC resistance, Re 3.4 Ω Voice coil inductance, Le 0.15 mH Effective piston area, Sd 119 cm2 Voice coil diameter 36 mm Voice coil height 17 mm Air gap height 5 mm Linear coil travel (p-p) 12 mm Magnetic flux density 1.17 T Magnet weight 0.13 kg Net weight 1.01 kg Free air resonance, Fs 29 Hz Sensitivity (2.83V/1m) 90.5 dB Mechanical Q-factor, Qms 5.0 Electrical Q-factor, Qes 0.29 Total Q-factor, Qts 0.27 Moving mass incl. air,Mms 12.6 g Force factor, Bl 5.2 Tm Equivalent volume, Vas 48 liters Compliance, Cms 2.39 mm/N Mechanical loss, Rms 0.46 kg/s Rated power handling* 60 W * IEC 268-5, T/S parameters measured on drive units that are broken in.