SB ACOUSTICS SB12PFCR25-8, 12cm FIBER CONE MIDWOOFER 8OHMFeatures Vented reinforced plastic chassis Proprietary cone material with natural fibers made in-house Butyl rubber surround for smooth frequency response Vented motor system for low compression Long stroke linear suspension for improved dynamics Non-resonant long life lead wires Specs Nominal Impedance 8 Ω DC resistance, Re 6.4 Ω Voice coil inductance, Le 0.36 mH Effective piston area, Sd 50 cm2 Voice coil diameter 25.4 mm Voice coil height 15 mm Air gap height 5 mm Linear coil travel (p-p) 10 mm Magnetic flux density 0.84 T Magnet weight 0.32 kg Net weight 0.7 kg Free air resonance, Fs 64 Hz Sensitivity (2.83 V / 1 m) 84.5 dB Mechanical Q-factor, Qms 4.10 Electrical Q-factor, Qes 0.65 Total Q-factor, Qts 0.56 Moving mass incl. air, Mms 5.1 g Force factor, Bl 4.5 Tm Equivalent volume, VAS 4.3 liters Compliance, Cms 1.21 mm/N Mechanical loss, Rms 0.5 kg/s Rated power handling* 30 W * IEC 268-5, T/S parameters measured on drive units that are broken in.
