SB ACOUSTICS SB15SFCR39-8, 15x25cm PAPER CONE RACETRACK WOOFER 8OHMFeatures Racetrack design Hard paper cone (made in-house) Optimized motor system Non-conductive reinforced vented coil former Symmetric suspension Low damping rubber surround Long life silver lead wires Vented chassis Specs nominal Impedance 8 Ω DC resistance, Re 6.2 Ω Voice coil inductance, Le 1.3 mH Effective piston area, Sd 178 cm2 Voice coil diameter 38.5 mm Voice coil height 16 mm Air gap height 6 mm Linear coil travel (p-p) 10 mm Magnetic flux density 0.94 T Magnet weight 0.54 kg Net weight 1.65 kg Free air resonance, Fs 32 Hz Sensitivity (2.83V/1m) 87.0 dB Mechanical Q-factor, Qms 7.11 Electrical Q-factor, Qes 0.45 Total Q-factor, Qts 0.42 Moving mass incl. air,Mms 23 g Force factor, Bl 8.0 Tm Equivalent volume, Vas 48.3 liters Compliance, Cms 1.08 mm/N Mechanical loss, Rms 0.65 kg/s Rated power handling* 80 W * IEC 268-5, T/S parameters measured on drive units that are broken in.
