SB ACOUSTICS SB16PFCR25-4-COAX, 18cm FIBER CONE COAX with 12mm SOFT DOME 4OHM Features Vented reinforced plastic chassis Proprietary cone material with natural fibers made in-house Soft low damping rubber surround for improved transient response Optimized motor system Non-resonant long life lead wires Compact large surround dome tweeter SpecsSPECS WOOFER: Nominal Impedance 4 Ω DC resistance, Re 3.2 Ω Voice coil inductance, Le 0.31 mH Effective piston area, Sd 119 cm2 Voice coil diameter 25.4 mm Voice coil height 14.3 mm Air gap height 5 mm Linear coil travel (p-p) 9.3 mm Magnetic flux density 1.1 T Magnet weight 0.36 kg Net weight 0.95 kg Free air resonance, Fs 36 Hz Sensitivity (2.83V/1m) 90 dB Mechanical Q-factor, Qms 2.6 Electrical Q-factor, Qes 0.35 Total Q-factor, Qts 0.31 Moving mass incl. air,Mms 12.5 g Force factor, Bl 5.1 Tm Equivalent volume, Vas 31.3 liters Compliance, Cms 1.56 mm/N Mechanical loss, Rms 1.1 kg/s Rated power handling* 40 W * IEC 268-5, T/S parameters measured on drive units that are broken in. SPECS TWEETER: Nominal Impedance 4 Ω DC resistance, Re 3.0 Ω Voice coil diameter 12.4 mm Voice coil height 1.2 mm Air gap height 1.5 mm Free air resonance, Fs 1300 Hz Sensitivity (2.83V/1m) 89 dB Rated power handling* 10 W Magnetic flux density 1.05 T Magnet weight 0.003 kg Net weight 0.014 kg
