SB ACOUSTICS SB12CACS25-4, 12cm CERAMIC CONE WOOFER 4OHMFeatures Vented cast aluminum chassis for optimum strength and low compression Ceramic cone Soft low damping rubber surround for improved transient response Shorting ring in motor system for reduced distortion Non-conducting fibre glass voice coil former for minimum damping CCAW voice coil for reduced moving mass Long life silver lead wires Vented pole piece for reduced compression 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 1.07 T Magnet weight 0.40 kg Net weight 0.92 kg Free air resonance, Fs 51 Hz Sensitivity (2.83 V / 1 m) 88 dB Mechanical Q-factor, Qms 4.89 Electrical Q-factor, Qes 0.33 Total Q-factor, Qts 0.31 Moving mass incl. air, Mms 6.1 g Force factor, Bl 4.3 Tm Equivalent volume, VAS 5.7 liters Compliance, Cms 1.60 mm/N Mechanical loss, Rms 0.4 kg/s Rated power handling* 30 W * IEC 268-5, T/S parameters measured on drive units that are broken in.
