SB ACOUSTICS SB19ST-C000-4, 19mm TEXTILE DOME TWEETERFeatures Optimized damping in pole cavity to eliminate internal reflection Fine weave soft fabric dome for smooth frequency response Saturation controlled motor system for reduced distortion CCAW voice coil for low moving mass Long life silver lead wires Specs Nominal Impedance 4 Ω DC resistance, Re 3.4 Ω Voice coil inductance, Le 0.07 mH Effective piston area, Sd 3.8 cm2 Voice coil diameter 19.1 mm Voice coil height 1.8 mm Air gap height 3 mm Linear coil travel (p-p) 1.2 mm Moving mass incl. air, Mms 0.22 g Free air resonance, Fs 980 Hz Sensitivity (2.83 V / 1 m) 88.5 dB Mechanical Q-factor, Qms 6.45 Electrical Q-factor, Qes 1.50 Total Q-factor, Qts 1.22 Force factor, Bl 1.75 Tm Rated power handling* 30 W Magnetic flux density 1.24 T Magnet weight 0.13 kg Net weight 0.32 kg * IEC 268-5, high-pass Butterworth, 2600 Hz, 12 dB/oct.