SB12PFCR25-4

SB ACOUSTICS SB12PFCR25-4, 123mm (4.5in / 4-1/2in) FIBER CONE MIDWOOFER 4 OHM

SB ACOUSTICS SB12PFCR25-4, 12cm FIBER CONE MIDWOOFER 4OHM Features 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 4 Ω DC resistance, Re 3.1 Ω Voice coil inductance, Le 0.26 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 58 Hz Sensitivity (2.83 V / 1 m) 87.5 dB Mechanical Q-factor, Qms 3.4 Electrical Q-factor, Qes 0.49 Total Q-factor, Qts 0.43 Moving mass incl. air, Mms 5.3 g Force factor, Bl 3.5 Tm Equivalent volume, VAS 5.2 liters Compliance, Cms 1.42 mm/N Mechanical loss, Rms 0.6 kg/s Rated power handling* 30 W * IEC 268-5, T/S parameters measured on drive units that are broken in.